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This is the paraboloidal mirror at the bottom of the tube.
是位于镜筒底部的一块抛物面镜。
youdao
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The primary mirror. This is the paraboloidal mirror at the bottom of the tube.
是位于镜筒底部的一块抛物面 镜。
youdao
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The primary mirror. This is the paraboloidal mirror at the bottom of the tube.
是位于镜筒底部的一块抛物面 镜。
youdao