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Summer's hot temperatures can make people feel exhausted - but also make them extremely grumpy, a study claims. 夏季的高温会让人觉得很疲惫，但一项研究称，它还会让人非常暴躁。 Northwestern researchers found that when people are uncomfortably hot, they are less willing to be helpful and are often more moody. 西北大学的研究人员们发现，当人们热得不舒服时，他们就会不太那么愿意帮助别人、而且会变得更加喜怒无常。 Previous studies show that in addition to having foul moods, soaring temperatures can cause people to be more violent and aggressive, with crime rates peaking during the summer. 之前的研究显示，除了会让人脾气不好之外，气温飙升还会导致人们更加暴力和好斗--夏季往往是犯罪率最高的时候。 | 
