名词
中文翻译：中焦距
同义词：
['middle focal length', 'middle focal point']
例句：
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1.The camera has a mid-focal length of 50mm.
这台相机的中焦距为50mm。
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2.The lens was designed to have a mid-focal length of 85mm.
镜头设计成具有85mm的中焦距。
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3.The photographer needs to adjust the focus to achieve a mid-focal length shot.
摄影师需要调整焦点，以达到中焦距拍摄效果。