正确应译为The fuction, which can set the the sound volume of power off, has been deleted.你的翻译是想用非限制定语从句，但是，which作为引导词代替后面从句的成分，而你的句子中主谓宾句子成分都有，不用代替，所以这里的翻译错了。
The function which is set up for adjusting the volume of power off has been deleted.
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