In case of urgency, call the police.

一旦发生紧急情况，打电话给警察。

《新英汉大辞典》

The Executive Committee can call for a meeting in case of urgency, postponement of meetings or change of meeting dates.

执委会可就紧急事务、会议延期或调整会议日期而召开会议。

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We must make up our minds at once in view of the urgency of the case.

鉴于情况紧急，我们必须立刻下定决心。

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We must make up our minds at once in view of the urgency of the case.

鉴于情况紧急，我们必须立刻下定决心。

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