angle point

• 立体角

angle point的用法和样例：

例句

1. The solid angle is this component divided by the square of the length of this line.
   立体角就是这个分量除以这条线的长度的平方。
2. The ratio of the flux emitted within the solid angle defined by the beam spread, to the bare lamp flux.
   由光束角限定的立体角内辐射出的光通量与裸光源光通量之比。