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To regulate revolving speed of fan is capable of saving energy markedly.
风机调速运行，节能效果是显著的。
youdao
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The ring is driven by a motor, revolving at motor speed.
该（旋转）环由电动机带动，其转速等于电动机的转速。
youdao
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The ring is driven by a motor, revolving at motor speed.
该（旋转）环由电动机带动，其转速等于电动机的转速。
youdao