Unplug the phone and use a white-noise machine, or a fan or an air conditioner, to block out background noise.
把电话线拔掉，使用一个能产生白噪声的机器，或是打开电风扇、空调，以阻断背景噪音。
The effect of protecting mesh of air conditioner outdoor unit on aero-acoustic noise is studied with experimental method.
采用实验研究的方法，首次研究了某型空调器室外机组防护网对气动噪声的影响。
The air conditioner in the office is making that strange noise again.
办公室里的冷气机又在发出那怪声了。
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