機不可失，時不再來 [机－－－－时－－来]

Jyutping gei1 bat1 ho2 sat1 ， si4 bat1 zoi3 loi4
Pinyin jī bù kě shī ， shí bù zài lái

Definitions (Wiktionary)
  1. proverb
    Opportunity seldom knocks twice.

機不可失，時不再來 [机－－－－时－－来]

Jyutping gei1 bat1 ho2 sat1 , si4 bat1 zoi3 loi4
Pinyin jī bù kě shī , shí bù zài lái

Definitions (CC-CEDICT)
  1. Opportunity knocks but once. (idiom)