介词短语
中文翻译：在
同义词：
['in case', 'should it happen', 'in the event of']
例句：
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1. In the event of a fire, we need to evacuate immediately.
万一发生火灾，我们需要立即疏散。
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2. Should it rain tomorrow, we'll postpone our picnic.
如果明天下雨，我们将推迟我们的野餐。
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3. In the event that you can't find your keys, please call me at home.
万一你找不到你的钥匙，请打电话给我。