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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。
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.
结论上腔静脉流速曲线中心室收缩波和心房收缩反向波速度在评价容量反应性中有一定应用价值。
Conclusions the peak velocities of wave s and wave ar are of good value in assessing the fluid responsiveness.
光滑表面会反射一个反向的优选极化波，而粗糙地区的反射波是左旋极化波。
While smooth surfaces send back a reversed, right-polarized wave, rough areas return left-polarized waves.
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