以下为句子列表：
英文: Material in the equatorial region of the cloud—that is, in the plane perpendicular to the rotation axis—moves inward more and more slowly as rotation starts to balance the pull of gravity.
中文: 当转动开始与重力的向内拉力平衡时，位在整团云气的赤道区域，垂直于转轴的平面上的物质，会逐渐减缓向内移动的速率。
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