事機

confidential aspects of a matter / secrets / key moment for action

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

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

military institution