Contigency
a. 预防性
🗣️ 情景例句
Thank you again.
再次感谢。
This is a diploma.
这是一张文凭。
It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
不久，一架直升飞机飞抵飞机失事现场，来搭救这几个幸存者。