名词
中文翻译：镜头开口
同义词：
['lens gap', 'aperture', 'aperture hole']
例句：
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1.The camera lens is the main part that focuses light onto the film.
相机的镜头是主要的部分，它把光线聚焦到胶片上。
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2. The lens of the telescope is responsible for focusing the image on the eyepiece.
望远镜的透镜负责将图像聚焦在目镜上。
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3.The photographer adjusted the lens to get a clearer shot.
摄影师调整了镜头，得到了更清晰的拍摄效果。