He amplified sound with the use of electronic equipment.
他用电子设备放大声音。
What seems to happen, the researchers reckon, is that when a screech on a chalkboard is generated, the sound is amplified within our ears to painful effect.
研究者们顺理成章地得出这样一个结论：当黑板被挂擦时，该声响在我们的耳内放大，加剧了痛苦。
A disorder of the inner ear called superior canal dehiscence syndrome causes every sound within the body to be amplified, even the movement of one's eyeballs, all the time.
一种称为“上半规管裂综合征”（下文称SCDS）的内耳道疾病会放大身体每处地方活动的声音，即便是眼球滚动的声音。
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