应用

to put to use / to apply / practical / applied (science, linguistics etc) / application / practical use / (computing) app

surname Ying / Taiwan pr. [Ying4]

to agree (to do sth) / should / ought to / must / (legal) shall

to answer / to respond / to comply with / to deal or cope with

to use / to employ / to have to / to eat or drink / expense or outlay / usefulness / hence / therefore