shí bù zài lái
Time that has passed will never come back. (idiom)
jī bù kě shī , shí bù zài lái
Opportunity knocks but once. (idiom)
jī bù kě shī , shī bù zài lái
opportunity knocks but once (idiom)
jī bù kě shī , shí bù zài lái
Opportunity knocks but once. (idiom)