名词
中文翻译：光柱
同义词：
['beam', 'light slit例句：1. The scientist used a light beam diaphragm to measure the distance between two objects.（科学家使用光柱来测量两个物体之间的距离。）']
例句：
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1. The scientist used a light beam diaphragm to measure the distance between two objects.
科学家使用光柱来测量两个物体之间的距离。
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2. The camera had a light beam diaphragm that could focus on a small area.
相机有一个光柱，可以聚焦在一个小区域。
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3.The doctor used a light beam diaphragm to illuminate the dark room.
医生使用光柱来照亮黑暗的房间。