名词
中文翻译：镜头止动器
同义词：
['eyepiece stopper', 'eyepiece stop']
例句：
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1.The camera's eyepiece stop is damaged, so we need to replace it.
相机的目镜止动器损坏了，我们需要更换它。
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2. The scientist used an eyepiece stop to adjust the focus of his microscope.
科学家使用了一个目镜止动器来调整显微镜的焦距。
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3.During the experiment, the technician carefully adjusted the eyepiece stop to ensure accurate measurements.
在实验过程中，技术员小心地调整目镜止动器以确保准确的测量结果。