词语

机不可失，时不再来谓良好的时机难得不可错过。

机不可失碰上适合的机缘绝不可错失。形容办事要抓住机遇当仁不让。例机不可失，时不再来。英Don't let slip an opportunity; A golden opportunity is not to be missed; Now or never！(谚); Occasion knoks but once;