beam

n.[C]

1. 樑；桁；（船等的）橫樑
2. 秤杆，天平橫杆
3. 傳動杆；吊杆；帆桁
4. 光線，光束，光柱
   The beam from a flashlight showed a beggar sleeping at his doorstep.

   手電筒的光照出一個乞丐睡在他家門口。

5. （定向發出的）電波
6. 笑容，喜色
   He greeted me with a beam of joy.

   他笑容滿面地迎接我。