机不可失，时不再来

jībùkěshī,shíbúzàilái

don't let slip an opportunity as it may never come again; opportunity knocks but once

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ji1 bu4 ke3 shi1 , shi2 bu4 zai4 lai2

Opportunity knocks but once. (idiom)

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機不可失，時不再來|机不可失，时不再来 [jī bù kě shī , shí bù zài lái] ► Opportunity knocks but once. (idiom)