功不可沒

one's contributions cannot go unnoticed (idiom)

meritorious deed or service / achievement / result / service / accomplishment / work (physics)

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]

(negative prefix for verbs) / have not / not

drowned / to end / to die / to inundate

(negative prefix for verbs) have not; not