pin nut

例句：

1. 1. The farmer used a nail nut to hang his clothes on the wall.
   农民用一个钉头坚果把衣服挂在墙上。
2. 2. She found a pin nut in her garden and decided to plant it.
   她在花园里发现了一个钉头坚果，决定种下它。
3. 3.The pin nut is a small, round fruit that grows on trees.
   钉头坚果是一种小而圆的果实，生长在树上。