semiangle of beam convergence

例句：

1. 1.The angle between the two semiangles is 60 degrees.
   两个半角之间的夹角是60度。
2. 2.The camera captured a perfect semiangle of the sunset.
   相机捕捉到了完美的半圆角度的日落。
3. 3.The architect designed a building with a semiangle that maximized natural light.
   建筑师设计了一座建筑，其半圆角度最大化了自然光的利用。