常理

常理	cháng lǐ	common sense / conventional reasoning and morals
常	Cháng	surname Chang
常	cháng	always / ever / often / frequently / common / general / constant
理	lǐ	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