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Verbs Nouns Adjectives/Adverbs Pronouns Prepositions Conjunctions
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emergency {n} (situation requiring urgent assistance) in a pinch {adv} (in a difficult situation)

Call the police in an emergency .	紧急情况请报警。
In an emergency he had nothing to fall back upon .	遇到紧急情况，他没有什么可以依靠的。
In case of emergency , call the police .	如遇紧急情况，请报警。

紧急情况请报警。

遇到紧急情况，他没有什么可以依靠的。

如遇紧急情况，请报警。