return beam vidicon

例句：

1. 1. The beamof light from the lamp illuminated theroom.
   灯发出的光束照亮了房间。
2. 2. Thebeam of sunlight fell on the grass.
   阳光的光束落在草地上。
3. 3. The beam of hisflashlight was shining through the window.
   他的手电筒的光束透过窗户。