按下按钮，以减少喇叭的音量。
此外，通过降低天花板的高度，木材的长度被缩短，也减少了空调的音量。
Moreover, by lowering the ceiling height, timber length was shortened and air-conditioning volume was also reduced.
如果在噪音源处减少噪音量行不通或不够要求，可以采用吸收或限制噪音的办法。
Where reducing the noise output at the source is impractical or insufficient, noise may be absorbed or confined.
重要的是要调低音量，每天使用个人音乐播放器的时间要控制在1小时以内，这样可以有效减少暴露在噪音中的时间。
Thee full report argued: "While it is important to keep the volume down, limiting the use of personal audio devices to less than one hour a day would do much to reduce noise exposure."
重要的是要调低音量，每天使用个人音乐播放器的时间要控制在1小时以内，这样可以有效减少暴露在噪音中的时间。
Thee full report argued: "While it is important to keep the volume down, limiting the use of personal audio devices to less than one hour a day would do much to reduce noise exposure."
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