18-point-support system is used as axial support in the 1 meter telescope primary mirror.
一米级天文望远镜主镜常采用18点底支承设计,以降低主镜面在重力作用下产生的变形误差。
参考来源 - 用ANSYS优化一米望远镜主镜18点底支承位置With the development of space optical technology, there exits higher demands for the larger-diameter primary mirror for the space usage.
随着空间光学技术的发展，人们对空间相机主反射镜提出了口径更大的要求。
参考来源 - 轻量化碳化硅反射镜支撑方案分析·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
N the mirror that collects and focuses the incoming light in a reflecting telescope 主镜
The Hubble's primary mirror, nearly eight feet across.
哈勃望远镜的主镜直径将近8英尺。
The primary mirror is 80 cm in diameter, a respectable size even for an observatory on the ground.
主镜的直径为80厘米，这一口径即使在地面天文台也是很可观的。
This is the distance (usually in mm.) from the lens (or primary mirror) to the point where the telescope is in focus (focal point).
就是从透镜(或者主反射镜)到焦点的距离，通常单位是毫米(mm)。
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