多年来我一直在MS-DOS下创建我的系统,但两年前我转用了Unix,从那以后我一直在用Unix工作。

For many years I had created my system under MS-DOS, but two years ago I switched and since then I've worked with Unix.

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For many years I had created my system under MS-DOS, but two years ago I switched and since then I've worked with Unix.

switched 是动词 switch 的过去式,switch 的意思是"转换、改变",这里指从 MS-DOS 系统转换到 Unix 系统。

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