knock pin

例句：

1. 1. He used a hammer pin to drive the nail home.
   他用锤子钉把钉子钉牢了。
2. 2.The hammer pin was so sharp that it could easily penetrate the wood.
   这个锤子钉非常锋利，很容易穿透木头。
3. 3. The hammer pin was used to hold the door open while we were inside.
   我们在里面时，用锤子钉来撑开门。