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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。
youdao
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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。
youdao