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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.
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.
在连续波泵浦下，反向自发辐射输出功率（ASE-）首先快速地增加到峰值功率，然后单调下降到稳态值；
Under continuous wave pumping, backward amplified spontaneous emission output power (ASE-) rapidly increases to peak value, and then decreases monotonically to steady-state value.
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