beam pencil

例句：

1. 1. The beam of the light fell on the table.
   光线的光束落在了桌子上。
2. 2. He stood up and beamed at her.
   他站起来，向她微笑。
3. 3. The beam of the sun illuminated the whole valley.
   太阳的光束照亮了整个山谷。