机不可失（機不可失）　

◎ 机不可失 jībùkěshī

[Don‘t let slip an opportunity;A golden opportunity is not to be missed;Now or never!(谚);Occasion knoks but once] 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

机不可失,时不再来