a moment of truth的用法和样例：
- This was a moment of truth in which evasion had no place.
- Some people thought Barry was a coward, but his moment of truth came when he rescued a child from a burning house.
- I have often wondered how I would react if I saw a girl in the street being attacked by a gang of hooligans. For me, that would be the moment of truth.
- It's time for a moment of truth: are your priorities what you thought they were?
- After a moment of cranking the motor finally kicked over.