体重发生急剧增加或减少的现象。

Drastic increase or decrease in weight.

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目的探讨东莞市5岁以下儿童低体重发生的危险因素。

OBJECTIVE to study on the dangerous factors that cause the underweight among children aged under 5 years in Dongguan.

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梨火疫病在中国的大部分地区适生，在有适宜寄主分布的地区，就可能严重发生。

Fire blight can survive in the majority part in China and might blast under suitable host plants and environmental conditions.

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Now when people gain enough weight, they gain it all over their body, but those are the typical weight gain patterns and it happens for hormonal reasons.

如果人们增重很多,那么他们全身会均匀地增胖,但刚才讲的是比较典型的增重模式,激素是导致它们发生的原因

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Although I don't quite understand--I should say, there's many things about how the fighting went on which we can only attempt to imagine because we just don't have films of ancient hoplite battles, I'm sorry to say.

虽然我有时也很困惑,比如说,战场上瞬息万变,情况非常复杂,由于没有古代重步兵白刃战的影像资料,我们只能猜想战场上发生了什么,真的是很遗憾

耶鲁公开课 - 古希腊历史简介课程节选