1. A search crew sent out emergency signals but there wasn't any answer. 
   搜查人员发出紧急信号但是却没有收到任何回答。
2. The crew couldn't deal with the emergency. They were all green recruits. 
   乘务员们不能应付紧急情况。他们都是新手
3. emergency repair of levee 
   堤防抢险
4. A crew of stagehands. 
   一群舞台工作人员
5. ready for emergency use. 
   准备在突然事件中使用。

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