Another way to explain it is to make the most of an opportunity when it is available.

另一种解释就是当机会来了的时候，充分利用机会。

It's used to tell someone to make the most of an opportunity and take as much of something as they can.

我们用它来告诉某人要最大限度地利用机会，尽可能多地利用一些东西。