机不可失，失不再来
jī​bù​kě​shī​shī​bù​zài​lái

opportunity knocks but once

  1. 机 機 jī noun
    opportunity
    (bound form) chance; opportunity; occasion
  2. 不可 bù​kě auxiliaryadjective
    cannot
    to be unable to; to be impossible
  3. 失 shī verb
    to miss
    to miss; to let slip; to fail to seize something like an opportunity or chance
  4. ， shī
    non-Chinese
  5. 失 shī verb
    to miss
    to miss; to let slip; to fail to seize something like an opportunity or chance
  6. 不再 bù​zài
    to not occur again
    (literary) to not repeat or happen a second time
  7. 来 來 lái verb
    to come
    To come; to arrive; to move toward the speaker; to crop up or happen