订书钉

例句：

1. 1. He carefully placed the paper between the pages of his notebook.
   他小心地把纸放在笔记本的页面之间。
2. 2. The teacher pinned up the blackboard with a piece of chalk.
   老师用一块粉笔把黑板钉起来。
3. 3. She used a stapler to fasten her notes together.
   她用订书机把笔记钉在一起。