Translation of "Processor" in Chinese

I must have someone repair my word processor.

我需要有人来帮我修文字处理器。

Compared to a computer, a word processor has a single purpose.

文字處理軟件和電腦不同的是，它只有一個用途。

I used to type my letters, but now I use a word processor.

以前我总是亲笔写信，而现在我利用文档处理程序。