[mào chōng]
pretend to be; pass sb. or sth. off as
pass shoddy products off as ones of high quality
次品冒充正品
pretend to be an expert; pose as an expert
冒充內行
He was unable to maintain the image of the perfect gentleman for which he had succeeded in passing at first.
他起初冒充正人君子， 可是無法繼續維持那個假象。