目的：观察耳科电钻噪声对豚鼠内耳功能和形态的影响，并探讨电钻噪声对内耳的损伤机制。

Objective: to study the effects of otologic drill noise on functions and morphology of the inner ears and investigate into the injury mechanism to the inner ears of guinea pigs.

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电钻传动齿轮噪声超标，意味着产品存在质量问题和安全隐患。

Excessive noise from transmission gear of electric drills means that the product still owns unclear problems in quality and security.

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从实验和理论上研究了手提电钻在工作时产生噪音的主要噪声源及其特点，为减少其噪音提供了依据。

This paper studys noise produced by portable electric drill on theory and experiment. It can help find methods of reducing portable electric drill noise.

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