a feathered board的用法和样例：
- A feather floated down on the wind.
- A feather, wing, fin, or similar appendage.
- She danced, light as a feather, eyes shining.
- Winning the medal was a feather in his cap.
- Winning the medal was a feather in his bonnet.
- Feather is very light, so that we say "as light as a feather".