多年来我一直在 MS-DOS 下创建系统,但两年前我转用了 Unix,从那以后我就用 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 本意是"开关、转换",在这里表示"转换、改用"不同的操作系统。

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