“长羽毛”的英语可以翻译为：feather，fledge ...

她脖子上围着一条粉色长羽毛围巾。She wore a large pink boa around her neck.这只小鸡很快就要长羽毛了.The chick will soon feather out.那些小鸟正在长羽毛.The nestlings are feathering out....