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prime focus observing capsule /ˈpɹaɪm ˈfəʊkəs ɒbzˈɜːvɪŋ ˈkapsjuːl/ n

中文：主焦点观测舱

中文 · 主焦点观测舱Español · cabina en el foco primarioFrançais · nacelle d’observation
Meaning：Area where astronomers once gathered to monitor the exposure time of photographic plates.
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Observatory cutaway

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