改进

改进	gǎi jìn	to improve; to make better / improvement / CL:个
改	gǎi	to change / to alter / to transform / to correct
进	jìn	to go forward / to advance / to go in / to enter / to put in / to submit / to take in / to admit / (math.) base of a number system / classifier for sections in a building or residential compound