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main tube /ˈmeɪn ˈstiːm ˈpaɪps/ n

中文：主镜筒

中文 · 主镜筒Español · tubo principalFrançais · tube
Meaning：The barrel of a telescope housing the optical system; light rays travel through the main tube.
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Found in these illustrated scenes（3）

Reflecting telescope cutaway Refracting telescope cutaway Reflecting telescope

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