事理

reason / logic

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

texture / grain (of wood) / inner essence / intrinsic order / reason / logic / truth / science / natural science (esp. physics) / to manage / to pay attention to / to run (affairs) / to handle / to put in order / to tidy up

reasonable / sensible

not understanding things (idiom); devoid of sense