改用

改用	gǎi yòng	to change over to / to switch to / to use (sth different)
改	gǎi	to change / to alter / to transform / to correct
用	yòng	to use; to make use of; to employ / (coverb) with; using / to need; to have to (usu. used in the negative or in questions) / usefulness; utility / (bound form) expense; outlay / (courteous) to eat; to drink / (literary) hence; therefore