当某事发生时
When something happens
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当某事发生时，某人记得他们正在做什么。
Sb remember what they were doing when STH happened.
youdao
当等待某人或某事时，你长时间无所适从，无所事事，因为在某事发生或某人到来之前你素手无策！
When you wait for something or someone, you spend some time doing very little, because you cannot act until that thing happens or that person arrives.
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