But the microphone and chip in the device sample the incoming sound and produce an inverted wave that cancels out just the sound of the drill.
但是装置里的麦克风和芯片从传入的声音中采样，并且产生抵消牙钻声的反向波。
2
The bus stopped at Eel Brook Common and the players led the singing on a radio microphone. When owner Abramovich gave a special wave the crowd erupted.