词组in event of,意思是如果,以防,例如:

1、The air bag would inflate in event of a collision to cushion front seat passengers.如果发生撞车,气袋会充气胀开保护前座的乘客。

3、In the event of the machine not operating correctly, an error code will appear.如果机器运转不正常,就会出现错误代码。