降低通气孔口径 延长耳道内耳模（earmold）的深度 更换耳模管子（tubing）为更细内径 逐渐增加声孔（sound bore）的口径 66 使用耦合器（coupler）换算助听器增益与实耳配戴增益（REAG）的差異，下列何项說明不正确？
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此外，也许世上没有其他人能让电子声如此悦耳动听（如1959-60的孔塔克特），而这些都是以前听到过的喀啦声与砰砰声。
And there was probably no one else who could make electronic sounds so lusciously melodic (as in “Kontakte”, of 1959-60), by sheer contrast with all the rattling and plicking that had gone on before.
有一天，一声大孔从森林里传来。狮子被猎人的网网住了。
One day, a large cry was heard in the woods. The lion was caught in a hunter's net.
进而计算了圆孔中的声质点速度，并分析了孔中速度的畸变情况、最后给出了圆孔的非线性声阻和声抗的理论值。
Furthermore, the time history and spectrum of the average flow velocity through an orifice are computed, from which the nonlinear distortion of flow velocity is analyzed.
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