名词
中文翻译：焦距
同义词：
['focal length', 'focal point']
例句：
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1. The camera is set at a 50mm focal length for this shot.
这张照片的焦距是50毫米。
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2. The scientist used a microscope to measure the object's focal length.
科学家使用显微镜测量了物体的焦距。
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3. The lens of the telescope has a focal length of 2 meters.
望远镜的镜头焦距为2米。