... anechoic chamber 消声室 anechoic test 消声试验 anelasticity 滞弹性，内摩擦力 ...
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anechoic room tyre noise test 消音室轮胎噪声试验
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To even reasonably run a scientific test, the iPhone should have been sitting on a non-metallic pedestal inside an anechoic chamber.
FORBES: The iPhone Antenna: It's Complicated
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