流刑
exile (as form of punishment)
流行
(of a contagious disease etc) to spread; to propagate; (of a style of clothing, song etc) popular; fashionable
流星赶月
lit. a meteor catching up with the moon; swift action (idiom)
流行性
(of a disease) epidemic; qualities that make sth popular or fashionable
流行语
popular jargon; catchword
猎户座流星雨
Orionids; Orionid meteor shower