The sound of a snore (up to 69 decibels) can be almost as loud as the noise of a pneumatic drill.

鼾声(最高达69分贝)的响度可能相当于风钻的噪音。

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A kind of pneumatic tray automatic drill was designed in order to improve work efficiency and work environment.

为了提高加工效率、改善工作环境，设计开发出一型气动盘式自动钻孔机。

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This paper designed a new type of muffler for pneumatic rock drill with the theory of impedance.

利用阻抗消声原理为气动凿岩机设计了一种新型的消声罩。

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