转动风扇：喇叭型风机集中的空气流通。
因为CPU变得很热，它必须高速转动风扇来降温。
Because the CPU gets so hot, it must use the fan at very high speeds in order to cool off.
终端开口与转动风扇的比较表明，无隔道进气道的后向散射主要来源于外罩唇口的电磁波散射。
The comparison results of the bump inlet with opening terminal and with rotating fan at the outlet indicate that the electromagnetic scattering comes mostly from the mouth of inlet.
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