Definition
if something should happen; in the case of an occurrence
如果某事发生；万一
In the event of a strike, the army will assume responsibility for firefighting.
在罢工的情况下，军队将承担灭火的责任。
We need to plan how to communicate in the event of a large-scale disaster.
我们需要计划如何在大规模灾害发生时进行沟通。
In the event of an emergency, oxygen masks will deploy from the aircraft ceiling.
在紧急情况下，氧气面罩会从飞机天花板上展开。