单词：now or never
音标：[nau ɔ: ˈnevə] ；
勿失良机; 机不可失; 时不再来; 只在此刻
now or never的用法和样例：
例句
- If it was a case of now or never I'd understand you driving over even in this fog.如果这是天赐良机，我也就理解你为什么会在这样的雾天里开车外出了。
- You've got to ask her. It's now or never.你得去问她.
- I felt it was now or never and went right up to him.我感到机不可失，所以径直走到他面前。