Crunch time
关键时刻
例句：
It's crunch time at work.
现在是工作的关键时刻。
The moment of truth:
关键时刻
例句：
Both men knew the moment of truth had arrived.
他们俩都知道紧要关头到了。
Make-or-break:
决定性的
例句：
It's make-or-break time for the company.
这是公司成败攸关的时刻。
When it comes to the point:
到了紧要关头
例句：
When it comes to the point, he always changes his mind.
一到关键时刻，他就改主意了。
