stud with under-cut groove

例句：

1. 1. He fixed the door with a new stud.
   他用一根新钉子固定了门。
2. 2. The carpenter used several studs to build the table.
   木匠用几根钉子搭建了桌子。
3. 3. The book was stapled together with a red ribbon.
   这本书是用红丝带订起来的。