注意，在开始会议呼叫时使用这个设备参数是无效的。

Note that it is not valid to use the device parameter when starting a conference call.

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现在这棵树还是无效的，因为它缺少关于设备之间互联的信息。稍后将添加这些信息。

This tree isn't valid at this point. It is missing information about connections between devices. That data will be added later.

youdao

为了评估和验证清洗过程，有的生产商在设备中按照与加工成品完全相同的操作参数进行无效对照药批次生产。

In order to evaluate and validate cleaning processes some manufacturers have processed a placebo batch in the equipment under essentially the same operating parameters used for processing product.

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