名词中文翻译
中文翻译：聚焦筒
同义词：
['focus tube', 'focusing tube']
例句：
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1. The engineer used a focusing barrel to focus the light on the screen.
工程师使用聚焦筒将光线聚焦在屏幕上。
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2. The scientist focused his attention on the problem at hand.
科学家把注意力集中在当前的问题。
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3. The camera was equipped with a focusing barrel that allowed for close-up shots.
这台相机配备了一个聚焦筒，可以拍摄近距离镜头。