Radar tracking of the shuttle, like the final accurate ground-based navigation, had not yet begun.
对航天飞机的雷达追踪，如最后精确的陆基导航，还没有开始。
First of all, space is not under a uniform hazard from ground-based weapons.
首先，太空各处受到地基武器的威胁程度并不相同。
Upon what ground is cognitive narratological research usually based?
认知叙事学展开研究的主要依据是什么?。
Upon what ground is cognitive narratological research usually based?
认知叙事学展开研究的主要依据是什么?。
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