turn a switch on or off

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• 英语翻译Figure 1:The conduction system of the heart 2.Figure 2:Experimental setup.Refer to Figure 4 for a zoomed in picture of the recording region.Figure 3:Pulse-echo of the 540kHz transducer off a flat air/water interface
• The classroom is enough bright.Pleaseturn off the lights.怎么改?
• 帮忙分析一下这个WITH引导的独立主格结构They were knocked off the bikes,one with the left arm broken while the other with one leg hurt
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• 为什么开关用ON和OFF而不用YES和NO
• lower upper off lower&upper 在烤箱上的
• turn off和switch off有区别吗,是否都仅用于电器.当然还有turn on和switch on.
• send messages by cells.译法