viewing aperture
... 观察者；观察器 viewer 取景孔 viewing aperture 观测显微镜 viewing microscope ...
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照相机取景孔 camera eye
摄像机取景孔 camera eye
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也就是说，你要用主视眼来看望远镜、照相机的取景器和钥匙孔——那样看更自然更方便。
It means that you should use your dominant eye when peering through a telescope, camera viewfinder or keyhole - it will feel much more natural and easier to see that way.
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