更新时间：2024-12-23 21:43:42
Noun:- mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
- a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it
- flat surface that rotates and pushes against air or water
- the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft
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