n any activity that is performed alone without assistance
n a musical composition for one voice or instrument (with or without accompaniment)
n a flight in which the aircraft pilot is unaccompanied
v fly alone, without a co-pilot or passengers
v perform a piece written for a single instrument
独奏曲, 独唱, 独奏, 独唱曲, 单独表演, 单飞, 单人纸牌戏