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。
A sealing ring is not possible with increased maximum speed.
一个密封环，是不可能增加的最高车速。
Two control ring work together to realize variable speed constant frequency.
运行时机组的两个控制环同时工作，实现变速恒频。
It is easy to operate. The drivers usually contest speed on zigzag ring roads.
车手往往在曲折环行路线上竞速。
It is easy to operate. The drivers usually contest speed on zigzag ring roads.
车手往往在曲折环行路线上竞速。
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