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机：机会；时：时机。好的时机不可放过，失掉了不会再来。
[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
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