機不可失，時不再來

Opportunity knocks but once. (idiom)

No time to lose! (idiom)

(bound form) machine; mechanism / (bound form) aircraft / (bound form) an opportunity / (bound form) crucial point; pivot / (bound form) quick-witted; flexible / (bound form) organic

no; not so / (bound form) not; un-

cannot / should not / must not

cannot; should not; must not

can / may / able to / to approve / to permit / to suit / (particle used for emphasis) certainly / very

used in 可汗[ke4 han2]

to lose / to miss / to fail

o'clock / time / when / hour / season / period

Time that has passed will never come back. (idiom)

no more / no longer

again; once more; re- / second; another / then (after sth, and not until then) / no matter how ... (followed by an adjective or verb, and then (usually) 也[ye3] or 都[dou1] for emphasis)

to come / to arrive / to come round / ever since / next