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secondary mirror /ˈsɛkəndəɹi ˈmɪɹə/ n

中文：副镜

中文 · 副镜Español · espejo secundarioFrançais · miroir secondaire
Meaning：Mirror that collects light and directs it toward the eyepiece.
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Observatory cutaway Hubble Space Telescope Reflecting telescope cutaway SLR camera cutaway

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