Then, if you had a flat disk with the curve going counterclockwise, the normal vector would go up.
就会得到一个被逆时针曲线包围的圆盘，法向量向上。
Spiral galaxies, such as the Milky Way, consist of a flat disk with a bulging center and surrounding spiral arms.
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。
Elliptical galaxies do not take on the flat-disk or spiral shapes that most galaxies do.
椭圆星系并不具有大多数星系具有的扁圆或是螺旋型的形状。
Elliptical galaxies do not take on the flat-disk or spiral shapes that most galaxies do.
椭圆星系并不具有大多数星系具有的扁圆或是螺旋型的形状。
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