1. There´s a socket behind the typewriter.
    打字机后面有一个插头.

2. There´s a socket behind the typewriter.
    打字机后面有一个插头.

3. She is mainly a typewriter.
    她主要是个打字员。

4. I bought my son a portable typewriter.
    我给儿子买了一台手提式打字机。