选用上排风结构，降低工作噪声；

Upper exhaust structure, which can decrease working noise.

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有效的风保护极大减少气流背景噪声。

Effective wind protection significantly reduces the background noise of air currents.

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例如，噪声也许发生在户外音乐表演时的风或者雨。

For example, noise may occur from wind or rain at an outdoor music presentation.

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例如，噪声也许发生在户外音乐表演时的风或者雨。

For example, noise may occur from wind or rain at an outdoor music presentation.

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