chiff.chaffn.（名词）A small European warbler(Phylloscopus collybita) with yellowish-green plumage. 棕柳莺：一种原产欧洲羽毛为黄绿色、形小的啭鸣鸟（棕柳莺） 来源：[Imitative of its song] [模仿它的歌声的象声词]
