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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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。

youdao