铁笔

例句：

1. 1.He used a pen to write down theimportant notes.
   他用笔写下了重要的笔记。
2. 2.The teacher asked the students to use theirpens to take notes during the presentation.
   老师要求学生们在演讲时使用他们的笔做笔记。
3. 3. The writer carefully wrote histhoughts on the blackboard with a pen.
   作家用笔在黑板上仔细地写下了他的思考。