- 释义：
- n. 开始；（病）发作
- 例句：
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The drug must be taken from the onset of the infection.
这种药必须在感染的最初期就开始服用.
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The onset of depression often follows a traumatic event.
抑郁症发作常常发生在遭受创伤之后.
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His first hit record marked the onset of an astonishing career.
他的第一张风行一时的唱片标志着惊人事业的开始.
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