forked knuckle

例句：

1. 1.He had a forked knuckle on his left hand, which madeit difficult to grip objects.
   他的左手有一个叉状指关节，这使得他很难握持物体。
2. 2. The forked knuckle was the result of a car accident.
   叉状指关节是一次车祸的结果。
3. 3. Sheused her forked knuckleto help her pick up the heavy box.
   她用她的叉状指关节帮助她拿起那个沉重的箱子。