據理力爭

to contend on strong grounds / to argue strongly for what is right

according to / to act in accordance with / to depend on / to seize / to occupy

according to reason / in principle

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

power / force / strength / ability / strenuously

to work hard for / to do all one can / to contend strongly

to strive for / to vie for / to argue or debate / deficient or lacking (dialect) / how or what (literary)