恒星的自转，是恒星结构和演化理论的难点。
Stellar rotation is a difficult problem of the theory of stellar structure and evolution.
恒星的自转，是恒星结构和演化理论的难点。
The star rotation is a difficult problem in the theory of the stellar structure and evolution.
演化恒星的色球活动与恒星自转周期间存在很好的相关性。
The relation between stellar chromospheric activity and rotation of evolution stars have a good relativity.
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