Circular disk was rotating about an axis tilted from the normal through the center.
圆盘绕一个通过中心与法线方向倾斜的轴转动。
This flat circular disk is our own Galaxy, the Milky Way, with its spiral structure.
这个圆盘就是我们的星系，银河系，带着旋涡的结构。
The general shape of the average nebula is that of a thin circular disk somewhat thick in the center.
星云最常见的形状是中间较厚边缘较薄的圆盘。
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