Chinese edit

cannot; should not; must not
 
maybe; perhaps; might
maybe; perhaps; might; possibly; or
 
lack; scarce; vacant post
lack; scarce; vacant post; to run short of
trad. (不可或缺) 不可
simp. #(不可或缺) 不可

Pronunciation edit


Idiom edit

不可或缺

  1. necessary; must-have; indispensable