Phrase
light beam
noun
光束
a column of light, as from a beacon or flashlight
- 1.
a column of light (as from a beacon)
光柱(如灯塔发出的)
光柱(如灯塔发出的)
In use
The light beam from the lighthouse guides ships safely to the harbor.
A narrow light beam passes through the small hole and projects an image on the screen.
The sensor detects any interruption of the light beam across the doorway.
a [adj] light beam
形容词可修饰light beam，如narrow, powerful等。
A narrow light beam passed through the slit.
一束狭窄的光束穿过了狭缝。
light beam + verb
光束常作为主语，后接illuminate, shine等动词。
The light beam illuminates the entire room.
光束照亮了整个房间。
direct/shine a light beam
动词常为direct, shine, aim等，表示控制光束方向。
He directed a light beam at the suspicious package.
他将一束光射向可疑包裹。
Common mistakes
He pointed at light beam.He pointed at a light beam.
汉语中'光束'前可不用冠词，但英语可数名词短语'light beam'前需要不定冠词a/an或定冠词the，否则语法不正确。
The beam light is very bright.The light beam is very bright.
汉语'光束'的词序是'光'（light）在前、'束'（beam）在后，但英语固定词序为'light beam'，不可颠倒。
Connections
Dictionary facts from ECDICT.