名词
中文翻译：回视镜机制
同义词：
['back sight', 'rear sight']
例句：
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1.The new camera has a drum back-sight mechanism that makes it easy to adjust the focus.
这款新相机有一个回视镜机制，使得调整焦点变得简单。
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2.In archery, the drum back-sight mechanism is used to help the shooter keep their eyes on the target.
在射箭中，回视镜机制被用来帮助射手将目光集中在靶心上。
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3. The pilot used the drum back-sight mechanism to quickly orient himself in the dark.
飞行员使用回视镜机制迅速在黑暗中定位自己。