... 致动器；调速控制器 actuator 听觉锐度 acuity of hearing 锐角曲柄 acute angle crank ...
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In recent years, the development of sensitive and accurate measuring equipment has made it possible to measure the acuity of hearing of any individual at different frequencies.
近年来研制出了一些灵敏而精确的测量设备，因而有可能测出一个人在不同频率下的听力。
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