介词短语
中文翻译：在需要时
同义词：
['when necessary', 'when needed', 'at the moment例句：1. We should always be prepared for emergencies at need.（我们应该随时准备应对紧急情况。）2. The teacher asked us to finish our homework at need.（老师让我们在需要的时候完成作业。）3. I will come to your aid at need.（我将在需要的时候来帮助你。）']
例句：
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1. We should always be prepared for emergencies at need.
我们应该随时准备应对紧急情况。
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2. The teacher asked us to finish our homework at need.
老师让我们在需要的时候完成作业。
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3. I will come to your aid at need.
我将在需要的时候来帮助你。