针的振动通过扬声器得到放大，现在他拥有了一架电吉他。
The needle's vibrations were amplified by the radio, and now he had an electric guitar.
在一架运七试验机上，激振器和扬声器分别被用来模拟由螺桨旋转在舱内引起的结构和气动噪声。
In a Y7 test airplane, the cabin noise is analogized by an exciter to structure-borne noise and by a loudspeaker to air-borne noise.
在一架运七试验机上，激振器和扬声器分别被用来模拟由螺桨旋转在舱内引起的结构和气动噪声。
In a Y7 test airplane, the cabin noise is analogized by an exciter to structure-borne noise and by a loudspeaker to air-borne noise.
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