n.羽毛，翎毛; 状态，心情; 种类; 桨叶的水平运动
v.给装上羽毛，用羽毛装饰; 使(桨)与水面平行; 长羽毛
She and my mother were birds of a feather.
Harry's appointment to this important post was a feather in his cap.
I taped the base of the feather onto the velvet.
Are they two birds of a feather, as you say?
The feather floated lightly in the air.