It's true that many animals shed tears, especially in response to pain.

的确，很多动物都会流泪，尤其是在面对疼痛的时候。

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Frequency of crying varies widely: some shed tears at any novel or movie, others only a handful of times in their lives.

哭泣的频率差别很大：有些人在看小说或电影时都会流泪，有些人一生中只会流几次泪。

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So the next time you reach a tissue box, or sob on a friend's shoulder, or shed tears at the movies, stop and reflect on why we cry and what it means to cry.

所以，当下次你拿起纸巾盒，趴在朋友的肩膀上哭泣，或在看电影时流泪时，停下来想一想我们为什么哭泣，以及哭泣意味着什么。

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You will have to shed the tears and you've got to bang your head on the wall and go through your own private struggle.

你们也要激动到流泪,懊悔到用脑袋撞墙,兴奋挣扎都要亲身经历

耶鲁公开课 - 基础物理课程节选

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