beam with single reinforcement

例句：

1. 1. The beam of the light was shining through the window.
   光线从窗户射进来。
2. 2. He stood up and beamed at his audience.
   他站起来，对着观众微笑。
3. 3. The beam of the spotlight fell on the stage.
   聚光灯的光束照在舞台上。