象银河系一样，螺旋星系由一个中间鼓起的扁圆盘和环绕在周围的螺旋形手臂组成。
Spiral galaxies, such as the Milky Way, consist of a flat disk with a bulging center and surrounding spiral arms.
在一个大厅里，中间有一个圆盘，写着当年被处死的十九个女巫的名字。
In a hall in the middle there is a disk, read the 19 year was executed witch's name.
星云最常见的形状是中间较厚边缘较薄的圆盘。
The general shape of the average nebula is that of a thin circular disk somewhat thick in the center.
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