at a emergency

• 在紧急时刻

at a emergency的用法和样例：

例句

1. He is a man to fall back on in case of emergency.
   他是一位在紧急时刻可以向其求助的人。
2. I hope we will all hang together in this emergency.
   我希望在这紧急时刻我们都团结在一起。