As for deep-space observatories on the far side of the moon, the Hubble telescope has done perfectly well alone in orbit, with only a few maintenance missions in 18 years.
英
美
释义
以月球远端的外太空望远镜为例,哈勃望远镜,就独自完美地完成了这一工作,18年间只需要几次维护工作。
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