“立即行动”的英文是什么？

Immediate Action

Now, Action!

do it immediately

immediate action/be swift to act 立即行动

They were swift to act.
他们立即行动。

There must be immediate action if chaos is to be avert.
要避免混乱就必须立即采取行动。

Immediate Action

如警方说“我们立即行动”！
We'd better take an immediate action!