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新东方-柯林斯雅思备考词典
onset
英 [ˈɒnset]
[NOUN]
1. [SING 单数型名词] （尤指不愉快事情的）开始
The onset of something is the beginning of it, used especially to refer to something unpleasant.
双语例句
例：Most of the passes have been closed with the onset of winter.
随着冬天的来临，大多数的关口都关了。