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main reflex mirror /ˈmeɪn ˈɹiːflɛks ˈmɪɹə/ n

中文：主反光镜

中文 · 主反光镜Español · espejo reflez principalFrançais · miroir principal
Meaning：Mirror that redirects light toward the focusing screen; when the photo is taken, it retracts so that light reaches the film.
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SLR camera cutaway

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