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🤔AI有效技巧合集🧠
❓:Could you delve into the historical significance of the color blue, particularly its scarcity in early literature where it was often described as shades of other colors? Furthermore, let's explore the philosophical notion that things未经named might not exist. Are there other instances in history that mirror this concept?

🧠:Okay, so I need to explore the historical significance of the color blue, especially why it was scarce in early literature and often described using other colors. Then, I have to discuss the philosophical idea that things without names might not exist, and find other historical examples of this concept. First, the color blue. I remember reading somewhere that ancient texts, like the Odyssey, don't mention blue. The sky was called bronze or something. Why is that? Maybe they didn't have a word for blue, so they didn't perceive it as a separate color? There's that study by Gladstone where he noticed Homer used colors strangely. Then maybe the development of color terms in languages follows a pattern, like Berlin and Kay's theory. They said cultures develop color terms in a certain order: black/white, red, green/yellow, blue, etc. So maybe early civilizations didn't have a word for blue, so they categorized it under other colors. Like how some languages today might use the same word for green and blue.But wait, the Egyptians had a blue dye, right? Lapis lazuli was rare and expensive. So maybe blue was recognized in some cultures but not others. The question is about its scarcity in early literature. So in ancient Greece, they might describe the sea as "wine-dark" instead of blue. That's interesting. So without a word for blue, they used metaphors or other color terms. Does that mean they couldn't see blue, or just didn't have a term for it? There's that theory by Sapir-Whorf about linguistic relativity, that language affects perception. But I think current consensus is that language influences how we categorize things, not necessarily what we can perceive. So they saw blue but didn't have a separate category, so described it as shades of green or something else.Now, the philosophical part: things not named might not exist. That's similar to the idea that language shapes reality. If a culture doesn't have a word for something, does that mean it doesn't exist in their conceptual world? Are there other historical examples? Maybe the Inuit having many words for snow. Although that's a debated example. But maybe other color terms. Like how Russian has separate words for light blue and dark blue, whereas English just uses modifiers. So Russians might perceive those as distinct colors. Another example could be the concept of zero. It wasn't always present in number systems. The invention of zero as a numeral changed mathematics. Before that, was the concept of nothingness not recognized? Or just not formalized? Similarly, ancient Greek philosophy struggled with the concept of the void or non-being. So the absence of a term might reflect a lack of conceptual framework.Also, historical legal terms. For instance, before certain rights were named, like "freedom of speech," were those rights not considered to exist? Or in science, before the term "oxygen" was coined, was the concept not recognized, even though the substance existed? Wait, but oxygen was discovered, not invented. So maybe the naming is about recognition and categorization. So the philosophical notion is that without a name, a concept isn't part of the collective consciousness or discourse. So in history, when a term is introduced, it allows people to discuss and conceptualize it. Like the term "sexual harassment" being coined in the 20th century; before that, the behavior existed but wasn't formally acknowledged or addressed.So putting this all together: blue's scarcity in early literature might be due to the lack of a specific term, leading to descriptions using other colors. Philosophically, naming things brings them into existence in a social or conceptual sense. Other examples include mathematical concepts like zero, legal rights, scientific terms, and social issues that gain recognition through naming.

🔑:The historical and philosophical exploration of the color blue and the impact of naming on existence reveals intriguing intersections between linguistics, perception, and culture: 1. The Scarcity of Blue in Early Literature- Homeric Descriptions: Ancient texts like Homer’s *Odyssey* describe the sea as "wine-dark" (οἶνοψ πόντος) and the sky as bronze or iron, lacking a distinct term for blue. This absence is not unique to Greek literature; similar patterns appear in Hebrew (Old Testament), Sanskrit, and Chinese texts.- Gladstone’s Observation: In the 19th century, William Gladstone noted Homer’s unconventional color terminology, sparking debate about whether ancient Greeks perceived colors differently. Linguist Lazarus Geiger later observed that blue was among the last colors to be named cross-culturally.- Berlin and Kay’s Theory: Anthropologists Brent Berlin and Paul Kay proposed that cultures develop color terms in a predictable sequence: black/white → red → green/yellow → blue. Early societies often grouped blue with green or dark hues, as seen in Japanese (*ao* for blue/green) or Welsh (*glas* for blue/gray/green).- Egyptian Exception: Ancient Egypt, however, had a distinct word for blue (*irtyu*) and even synthesized blue pigment (Egyptian blue), linking it to divinity and the Nile. This highlights that recognition of blue depended on cultural priorities, such as art or trade (e.g., lapis lazuli from Afghanistan). 2. Perception vs. Naming- Linguistic Relativity: The Sapir-Whorf hypothesis suggests language shapes thought, but modern research indicates that while lacking a word for blue doesn’t impede perception, it affects categorization. For example, Russian speakers (who have separate terms for light blue, *goluboy*, and dark blue, *siniy*) distinguish shades faster than English speakers.- Metaphorical Flexibility: Early descriptions of blue as "sky-like" or "water-like" reflect associative thinking. The term *blavus* (blue) entered Latin later via Germanic languages, underscoring its gradual lexicalization. 3. Philosophy: Naming and ExistenceThe idea that unnamed things might not "exist" in a conceptual sense draws from several traditions:- Plato’s Forms: Plato argued that language captures eternal ideals, implying unnamed concepts remain unrealized in human discourse.- Nietzsche’s Perspectivism: Friedrich Nietzsche contended that language constructs reality, with unlabeled phenomena slipping into obscurity.- Modern Examples: - Zero: Ancient Mesopotamians and Mayans used zero as a placeholder, but Indian mathematicians (e.g., Brahmagupta) formalized it as a number, revolutionizing mathematics. - Rights: Concepts like "human rights" or "gender equality" gained traction only after being articulated, though the underlying ideas existed. - Science: Terms like "oxygen" (named by Lavoisier) or "gravity" (theorized by Newton) transformed vague observations into structured knowledge. - Social Issues: The term "sexual harassment," coined in the 1970s, allowed society to legally and culturally address previously unacknowledged behavior. 4. Historical Parallels- Inuit Snow Lexicon: While often oversimplified (they use descriptive phrases, not distinct words), the Inuit language reflects nuanced environmental categorization, showing how necessity shapes vocabulary.- Legal Fiction: Medieval Europe’s "corporate personhood" emerged through naming, enabling entities like guilds to act legally.- Mental Health: Terms like "anxiety" or "depression" evolved from vague "melancholy" to clinically defined concepts, altering treatment and societal understanding. ConclusionBlue’s late lexicalization reveals how language filters sensory experience, prioritizing practical and cultural needs. Philosophically, naming acts as a threshold for collective recognition, transforming abstract phenomena into shared reality. From zero to human rights, history shows that what we name, we make tangible—a testament to the power of language in shaping existence.

❓:能否分享一下你对“知识可以改变命运”这句话的理解和见解?

🧠:好的,用户问我对“知识可以改变命运”的理解和见解。首先,我需要明确这句话的核心是什么。知识改变命运,这是一个常见的说法,但具体怎么理解呢?可能用户想了解这句话的现实意义,或者背后的逻辑,甚至可能有自己的疑问,比如在当今社会是否仍然适用。接下来,我得考虑用户可能的背景。可能是学生,或者正在努力提升自己的人,也可能有遇到困境的人,希望通过知识改变现状。需要兼顾不同角度,既有理论上的解释,也要有实际例子,让回答更有说服力。然后,要考虑如何结构化解说。比如,先分析传统意义上的理解,再探讨现代社会的复杂性,比如知识爆炸、信息过载的问题。还要提到结构性因素,比如教育机会不均等,避免把责任全归咎于个人,这样更全面。还要注意辩证思考,不能只说知识的好处,也要提到其局限性。比如,知识如何应用,批判性思维的重要性,以及系统性障碍的存在。这样回答会更平衡,避免过于片面。可能用户还想知道具体怎么做,所以需要给出建议,比如终身学习、选择有价值的知识、实践结合等,让回答更具实用性。最后,要确保语言口语化,自然,避免学术化的表达,让读者容易理解。同时,检查逻辑是否连贯,覆盖不同层面,确保回答全面且有深度。

🔑:"知识可以改变命运"这句话在不同时代的认知语境下有着截然不同的诠释价值。我们既要看到它在启蒙时代打破阶级固化的进步性,也要直面当代知识资本化浪潮中的现实困境。在工业化初期,专业知识的获取确实为劳动者提供了阶级跃升的路径。19世纪英国技工学院的学徒通过掌握蒸汽机维修技术,能够获得远超农业劳动者的收入;20世纪初美国常春藤大学对少数族裔的有限开放,确实创造了个体突破种族隔离的成功案例。这种改变命运的可能性,源于知识在当时仍属稀缺资源。然而进入后工业时代,知识的生产与传播机制发生了本质性转变。教育产业化使知识获取成为资本投入行为,贫困家庭子女从基础教育阶段就面临资源剥夺。全球顶尖学府的入学竞争中,SAT辅导、科研履历包装等隐性成本,早已将寒门子弟隔离在机会之外。更值得警惕的是,知识本身正在异化为压迫工具——算法工程师优化外卖骑手的剥削系统,金融精英设计次级债产品掠夺中产财富,这揭示出知识在资本逻辑下的异化本质。在知识经济时代,真正改变命运的不再是知识储备量,而是对知识资本的运作能力。当编程技能成为新时代的"流水线劳动",当海归学历贬值为求职门槛,个体通过知识改变阶层的空间正急剧收窄。结构性困境凸显:教育投资回报周期延长,职业赛道迭代加速,知识折旧率呈指数级增长。那些坚信"读书改变命运"的农村大学生,往往在毕业时已背负助学贷款与落后知识体系的双重枷锁。这种困局并非否定知识价值,而是呼吁重新定义知识的赋能维度。批判性思维、跨学科整合能力、技术创新意识等元能力,正在取代传统知识记忆的重要性。北欧教育体系强调的"学会学习"素养,新加坡推动的终身技能学分制,都指向后知识时代的能力重构。真正的命运转变,在于将知识转化为创造新价值的生产力,而非在既定规则下进行存量竞争。因此,这个命题需要置于更广阔的社会变革框架中理解。当知识民主化进程与教育资源公平分配同步推进,当社会为知识创新提供可持续的回报机制,"改变命运"才能突破个体叙事,成为推动文明进步的集体动能。否则,所谓知识改变命运,不过是精巧编制的阶层流动幻觉。

❓:学校买来15只排球各23只足球,共用去350元.每只足球8.5元,排球每只多少元?

🧠:嗯,我现在有一道数学题,题目是说学校买了15只排球和23只足球,总共花了350元。已知每只足球8.5元,问排球每只多少钱。好的,我得仔细想想怎么解决这个问题。首先,我应该理清楚题目给出的信息。题目里说买了15个排球和23个足球,总共用了350元。每个足球的价格是8.5元,那排球的价格呢?是需要求的未知数,对吧。那我应该怎么列方程呢?首先,我可能需要用代数的方法来解这个问题。假设排球的价格是x元每个,那么总花费应该是排球的总价加上足球的总价等于350元。排球的数量是15个,每个x元,所以排球的总价就是15x元。足球的数量是23个,每个8.5元,所以足球的总价就是23乘以8.5元。然后这两部分加起来等于350元,对吗?所以,等式应该是:15x + 23×8.5 = 350。这就是方程,接下来我要解这个方程,求出x的值。接下来,我需要先计算23乘以8.5是多少。这个计算可能有点麻烦,我需要仔细算一下。23×8的话等于184,然后23×0.5就是11.5,所以加起来是184+11.5=195.5元。对吗?是的,23个足球总共花了195.5元。那原来的方程就变成了15x + 195.5 = 350。接下来我要解这个方程。首先,把195.5移到右边,也就是350减去195.5,然后得到15x的结果。那350减去195.5是多少呢?让我算一下:350减去200是150,但这里只减了195.5,所以应该加上4.5回去,所以结果应该是154.5。对吗?这样,15x = 154.5,那么x就是154.5除以15。现在计算这个结果。15乘10等于150,所以154.5减去150等于4.5,这样剩下的是4.5除以15,等于0.3。所以x=10.3元?对吗?不过,我需要再检查一下计算步骤是否正确。特别是当计算23×8.5的时候,有没有出错。让我再计算一次:23×8=184,23×0.5=11.5,184+11.5=195.5,没错。然后是350减去195.5等于154.5,没错。然后154.5除以15,确实是10.3。不过,题目中的金额是否有小数点后一位的限制呢?实际应用中,价格通常保留到小数点后两位,但这里的结果是10.3元,也就是10元3角,是否合理呢?或者可能有计算错误?让我再仔细检查一遍。总价是350元,足球的总价是23×8.5=195.5元,没错。然后用350减去195.5得154.5元,这是排球的总价。排球的数量是15个,所以每个的价格是154.5÷15=10.3元。是的,没错。因为15×10=150,15×0.3=4.5,150+4.5=154.5,刚好吻合。所以,答案应该是排球每个10.3元。不过,是不是需要用分数或者更精确的小数来表示呢?不过题目中给出的足球价格是8.5元,也就是带有小数点后一位,那么答案也应该保留到小数点后一位即可,即10.3元。或者是否需要四舍五入到分,也就是两位小数呢?不过题目中的8.5元是精确到角,所以可能这里的结果也要精确到角,也就是小数点后一位,所以10.3元就可以了。或者题目可能需要以元为单位,两位小数,那10.3元就是10.30元,但可能题目这里直接接受一位小数。总之,经过计算,排球每个的价格是10.3元。对吗?但再检查一遍所有的步骤是否正确。首先设排球价格为x元每个,总价是15x。足球总价23×8.5=195.5元。总花费是350元,所以15x +195.5=350。解得15x=350-195.5=154.5,所以x=154.5÷15=10.3。没错,所有步骤都正确。那这个答案应该对吧。所以,排球每只10.3元。不过,通常价格可能会用两位小数,比如10.30元,但可能因为原题中的足球价格是8.5元,也就是一位小数,所以这里也保留一位小数即可。所以答案是10.3元。

🔑:学校购买了15只排球和23只足球,总费用为350元。已知每只足球8.5元,设每只排球的价格为( x )元。根据题意可列出方程:[15x + 23 times 8.5 = 350]首先计算足球的总费用: [23 times 8.5 = 195.5 text{元}]代入方程后得到: [15x + 195.5 = 350]将195.5移到等号右边: [15x = 350 - 195.5 = 154.5]解得排球单价为: [x = frac{154.5}{15} = 10.3]因此,排球每只的价格为(boxed{10.3})元。

❓:我想在Excel里算一下距离特定日期字符串(像"2023-04-29 08:50:05Z"这样的格式)还有多少天,能教我怎么用公式吗?

🧠:嗯,用户想在Excel里计算距离特定日期字符串还有多少天。日期格式是"2023-04-29 08:50:05Z"。首先,我需要确定这个日期字符串在Excel中如何正确转换为日期值,因为如果直接输入的话,可能Excel无法识别,特别是末尾的Z代表时区,可能需要处理。首先,用户的目标是计算当前日期与该指定日期之间的天数差。所以可能需要用到TODAY()函数来获取当前日期,然后用目标日期减去当前日期。但问题在于如何将那个字符串转换为Excel能识别的日期格式。日期字符串是"2023-04-29 08:50:05Z",里面的Z表示UTC时间,但用户可能只需要日期部分来计算天数差,时间部分可能可以忽略,或者需要考虑时区转换。但考虑到天数通常是以天为单位,可能不需要考虑时间细节,所以可能可以提取日期部分。Excel中处理这种字符串的话,可能需要用文本函数来提取日期部分。比如用LEFT函数取出前面的日期部分,即LEFT(A1, 10),假设原字符串在A1单元格,这样得到"2023-04-29"。然后用DATEVALUE函数将其转换为日期序列值。不过DATEVALUE对于这种带有连字符的日期格式是否有效呢?可能需要测试一下。例如,DATEVALUE("2023-04-29")应该能返回正确的序列值,因为Excel通常能识别这种ISO格式的日期。接下来,用这个转换后的日期减去TODAY(),得到天数差。需要注意,TODAY()返回的是当前日期,不带时间,所以如果目标日期的时间部分超过当前时间的话,可能需要考虑是否要四舍五入天数,或者直接取日期差。例如,如果今天是2023年4月28日,目标时间是4月29日早上8点,那么是否算作还有1天,还是不到一天?用户可能只需要按日期计算,即日期部分之差,所以可能直接使用日期部分相减即可。所以可能的步骤是:先用文本函数提取日期部分,转换为日期值,然后减去当前日期。公式可能是:=DATEVALUE(LEFT(A1,10)) - TODAY()但需要确保单元格中的日期字符串是文本格式,如果是的话,没问题;如果Excel已经将其识别为日期时间格式,那可能直接使用即可,不需要转换。例如,如果原字符串被Excel正确识别为日期时间,则可以直接用INT(A1)来去掉时间部分,然后用=TEXT(A1, "yyyy-mm-dd")可能?或者直接=A1 - TODAY(),但可能得到带有小数天的结果,这时候用INT或者ROUNDDOWN来处理?如果用户的数据是文本格式的,那么需要转换,如果已经是日期格式,就不需要。所以需要先确认数据输入格式。例如,如果用户在单元格中输入"2023-04-29 08:50:05Z"作为文本,Excel可能无法自动识别为日期时间,这时候需要手动转换。另外,可能需要注意Excel中的日期系统设置,是1900还是1904日期系统,但大多数情况下都是默认的1900,所以可能没问题。另外,如果字符串中的Z影响转换,可能需要将其替换掉。例如,用SUBSTITUTE函数去掉Z,再转换成日期时间值。例如,DATEVALUE(SUBSTITUTE(LEFT(A1,19),"Z",""))可能?不过DATEVALUE可能不支持带时间的转换,这时候可能需要用DATEVALUE和TIMEVALUE分开处理,或者直接用VALUE函数?或者,更好的方法可能是使用SUBSTITUTE将Z替换为空,然后使用--(双负号)将文本转换为Excel的日期时间序列值。例如,假设单元格A1中是文本"2023-04-29 08:50:05Z",我们可以用公式=SUBSTITUTE(A1,"Z","")来得到"2023-04-29 08:50:05",然后用=--SUBSTITUTE(A1,"Z","")将其转换为序列值,前提是Excel能识别这种格式为日期时间。如果成功的话,这个转换后的值会是日期时间的序列数,然后可以用INT()函数提取日期部分,然后减去TODAY(),得到天数差。例如,公式可能是:=INT(--SUBSTITUTE(A1,"Z","")) - TODAY()这样,INT函数将日期时间转换为序列号的整数部分,即日期部分,然后减去TODAY()得到天数差。但需要确保SUBSTITUTE后的字符串能被Excel识别。例如,如果字符串变成"2023-04-29 08:50:05",Excel是否能正确转换?可能需要测试。或者可能需要用DATEVALUE和TIMEVALUE分开处理,但可能更麻烦。另外,可能需要注意区域设置中的日期格式问题,比如某些区域设置可能将"04-29"识别为4月29日还是29月4日的问题。但原字符串中的日期是年-月-日,所以可能不会有问题,因为Excel一般能正确识别带连字符的ISO格式。总结可能的公式:方法一:提取日期部分并转换为日期=DATEVALUE(LEFT(A1,10)) - TODAY()但需要确保LEFT(A1,10)得到的是正确的日期格式文本。方法二:替换Z并转换为日期时间,再取日期部分=INT(--SUBSTITUTE(A1,"Z","")) - TODAY()或者,如果需要包括时间,但天数以完整的天数为准,比如截止到当天的结束,可能需要考虑是否要向上取整或者向下取整,但通常天数差直接用日期部分相减即可。可能方法二更可靠,但需要用户的数据是文本格式。如果数据已经被Excel识别为日期时间格式,可能可以直接用=A1 - NOW(),但NOW()包括当前日期和时间,而TODAY()仅日期。所以如果用户的数据已经是正确的日期时间,那么天数差可以是=INT(A1) - TODAY(),因为INT(A1)会去掉时间部分,得到当天的日期序列值。例如,如果A1是日期时间序列值,那么:=INT(A1) - TODAY()或者,如果数据是正确格式的,可能更简单。但用户的数据是字符串形式,可能需要先转换。此外,用户的问题中提到“特定日期字符串”,所以可能该日期是作为文本存在的,而不是Excel识别的日期时间格式。所以需要转换步骤。综上,正确的步骤可能是:1. 将文本转换为Excel日期时间值,考虑替换掉Z,然后转换为序列值。2. 提取日期部分。3. 计算与当前日期的差。因此,最终的公式可能是:=DATEVALUE(LEFT(SUBSTITUTE(A1,"Z",""),10)) - TODAY()或者:=INT(--SUBSTITUTE(A1,"Z","")) - TODAY()或者:=DATEVALUE(LEFT(A1,10)) - TODAY()但需要测试这些公式是否有效。例如,当原字符串是文本时,SUBSTITUTE去掉Z后的字符串是否被DATEVALUE识别?例如,假设A1中的文本是"2023-04-29 08:50:05Z",SUBSTITUTE(A1,"Z","")得到"2023-04-29 08:50:05",LEFT得到前10个字符是"2023-04-29",DATEVALUE应该能将其转换为日期值。所以,用DATEVALUE(LEFT(SUBSTITUTE(A1,"Z",""),10))是否正确?或者是否需要先替换Z,然后再取左边?例如:LEFT(SUBSTITUTE(A1,"Z",""),10)是否还是"2023-04-29"?是的,因为原字符串是"2023-04-29 08:50:05Z",替换Z后变成"2023-04-29 08:50:05",左边10个字符仍然是"2023-04-29"。所以,DATEVALUE(LEFT(SUBSTITUTE(A1,"Z",""),10)) - TODAY() 是否正确?或者,可能更简单的是,因为时间部分的存在是否会影响LEFT的结果?例如,原字符串中的日期部分是前10个字符,替换Z之后,前面的结构不变,所以LEFT(...,10)仍然正确。或者,是否可以直接使用DATEVALUE(LEFT(A1,10)),因为即使有Z,左边前10个字符还是"2023-04-29",所以DATEVALUE(LEFT(A1,10))会正确转换?是的。因为无论有没有Z,前10个字符都是日期部分,所以公式=DATEVALUE(LEFT(A1,10)) - TODAY() 可能更简洁,不需要替换Z。测试一下:假设A1中是文本"2023-04-29 08:50:05Z",LEFT(A1,10)得到"2023-04-29",DATEVALUE处理这个应该没问题。所以最终的公式是:=DATEVALUE(LEFT(A1, 10)) - TODAY()这样就能得到该日期与今天之间的天数差。如果结果是正数,表示还有多少天;负数则表示已经过去多少天。但需要注意,如果用户的数据中,日期部分的格式可能有变化,比如某些情况下日或月的位置可能不同,但用户给出的例子是标准的年-月-日格式,所以应该没问题。另外,如果目标日期的时间部分在当前日期的后面,比如目标日期是今天下午,而当前时间是早上,是否需要算作0天还是1天?如果用户希望按整天计算,那么使用日期部分相减是正确的,不管时间如何。例如,假设今天是2023年4月29日,不管当前时间,目标日期的日期部分是2023-04-29,那么差为0天。如果目标日期是2023-04-30,则差为1天,无论时间。所以公式=DATEVALUE(LEFT(A1,10)) - TODAY() 是正确的。另外,有可能用户希望将Z考虑进去,即转换成正确的UTC时间,然后根据本地时区调整,但这种情况比较复杂,可能用户只需要简单的日期差,不需要精确到小时,所以可以忽略时区的影响,直接取日期部分。总结:正确的公式应该是=DATEVALUE(LEFT(A1,10)) - TODAY(),如果A1中的日期字符串是文本格式,并且前10个字符是"YYYY-MM-DD"。如果Excel无法正确转换,可能需要使用SUBSTITUTE来处理可能的格式问题,但根据问题描述,LEFT提取前10字符已经足够。

🔑:在Excel中计算距离指定日期字符串的天数差,可以使用以下步骤: 公式解释1. 提取日期部分:使用`LEFT`函数获取字符串的前10个字符(即"YYYY-MM-DD")。2. 转换为Excel日期:通过`DATEVALUE`函数将文本转换为Excel可识别的日期序列值。3. 计算天数差:用转换后的日期减去当前日期(`TODAY()`)。 公式```excel=DATEVALUE(LEFT(A1, 10)) - TODAY()``` 步骤说明1. 假设日期字符串在A1单元格,例如`"2023-04-29 08:50:05Z"`。2. 提取日期文本:`LEFT(A1, 10)`得到`"2023-04-29"`。3. 转换为日期值:`DATEVALUE("2023-04-29")`返回Excel的日期序列数。4. 计算差值:减去`TODAY()`(当前日期)得到剩余天数。 示例- 如果今天为`2023-04-28`,结果为`1`(天)。- 如果今天为`2023-04-30`,结果为`-1`(已过1天)。 注意事项- 确保输入的日期字符串格式为`"YYYY-MM-DD HH:mm:ssZ"`。- 若单元格格式显示为数字,请将其更改为“常规”或“数字”以查看天数差。

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