bird's-foot

例句：

1. 1.The ancient Chinese used to use this as a symbol of good luck.
   古代中国人曾用它作为好运的象征。
2. 2. The artifact is believed to have been left by a bird's foot.
   这个文物被认为是一只鸟的爪子留下的。
3. 3. The museum exhibits various bird's feet from around the world.
   博物馆展示了来自世界各地的各种鸟爪。