- 问题详情: Sometimes,youjustcan’thelpit.Maybeyou’rewatchingasadmovie,orthinkingaboutthefriendwhomovedaway.Nextthingyouknow,youreyesarewatering,andyouhavetearsrunningdownyourcheeks.Whydopeoplecrywhentheyareemotional?Whataretears?Scientistsareworkinghardto...
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