They both offer great sound insulation, as well as various sounds designed to induce sleep, and a built-in ventilation system.
它们都提供了很好的隔音效果，以及各种旨在引导睡眠的声音，以及内置的通风系统。
Sound insulation
原声例句
中级英语短文
纯飞行
Indeed, the chevrons were so effective at reducing noise than Boeing estimated hundreds of pounds of sound insulation could be removed from the aircraft.
事实上，人字形在降低噪音方面的效果如此之好， 波音公司估计可以从飞机上去除数百磅的隔音材料。
英语百科
Soundproofing
（重定向自Sound insulation）
Soundproofing is any means of reducing the sound pressure with respect to a specified sound source and receptor. There are several basic approaches to reducing sound: increasing the distance between source and receiver, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles, or using active antinoise sound generators.
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