beam with fixed ends

例句：

1. 1. The beam of the light is shining through the window.
   光线通过窗户射进来。
2. 2. The beam of the sun is warm on our faces.
   太阳的光束温暖地照在我们脸上。
3. 3.The beam of the spotlight was shining directly at me.
   聚光灯的光束直接照在我身上。