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。
As it neared the ground, it lost power. Its navigation system stopped working.
当接近地面时，飞机突然失去控制导航系统也停止工作。
As it neared the ground, it lost power. Its navigation system stopped working.
当接近地面时，飞机突然失去控制导航系统也停止工作。
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