| 释义 |
on.setH5Bn7set, $5B:n-n [U]the moment at which something that is usually unpleasant begins开始There are usually several years between exposure to the virus and the onset of illness.从病毒入侵到发病，中间通常隔几年。The new treatment can delay the onset of the disease by several years.这种新的治疗方法可以推迟几年发病。The negotiators have given up hope of signing a peace settlement before the onset of winter.谈判人员已放弃在冬天开始之前签署和平协议的希望。
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