He had written letters on official notepaper to promote a relative's company.

他用官方信纸写信推荐一个亲戚的公司。

He reached into his pocket and withdrew a sheet of notepaper.

他把手伸进口袋，拿出一张便签。

We have run out of head notepaper.

我们已用完了有抬头的信纸。

My computer is broken so I have to use notepaper.

我的电脑坏了，因此我只好使用信纸。

I folded my notepaper and headed for the library.

我折叠起笔记本，往图书馆走去。