... conical projection 圆锥投影 conical shutter 锥形快门 coniferous forest 针叶林 ...
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conical l shutter 锥形快门
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In order to reduce the obscuration, conical baffle of secondary mirror is ameliorated into a shutter one.
为了减小初始中心遮光比，将次镜锥状遮光罩改进为百叶窗式结构；
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