早型O，B型星有扩散运动和自转运动，而晚型发射线星则没有明显的扩散或收缩的整体运动。
The expansion and rotation of the early O, B type stars have been found, but the similar motions are not discernible for the late-type stars.
早型O，B型星有扩散运动和自转运动，而晚型发射线星则没有明显的扩散或收缩的整体运动。
The expansion and rotation of the early O, B type stars have been found, but the similar motions are not discernible for the late-type stars.
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