名词
中文翻译：目标焦距
同义词：
['objective distance', 'objective focus']
例句：
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1.The camera's objective focal length is 50mm.
相机的物镜焦距是50毫米。
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2. The scientist measured the object's objective focal length to be 10cm.
科学家测量了物体的物镜焦距为10厘米。
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3.The photographer focused her lens at a distance of 10 meters to achieve the desired objective focal length.
摄影师将镜头对准10米的距离，以达到所需的物镜焦距。