Fan noise is the most primary noise fountain in the continuous wind tunnel.
风扇噪声是连续式风洞最主要的噪声源。
An optional backup vent fan operates in the event of a primary vent fan failure.
如果主排气扇出现故障，则备用排气扇将启动。
An optional backup vent fan operates in the event of a primary vent fan failure.
如果主排气扇出现故障，则备用排气扇将启动。
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