提出了最小安全飞行高度的有向性问题。
The orientation of the minimal safe flight height is researched.
在飞行过程中，它达到了3000英尺的高度并在一个安全的区域内进行了一系列轻巧的转弯。
During its flight, it reached 3,000 feet and performed a series of gentle turns all over a safe area.
越高耗费的燃料越少，而载人飞船能够长时间安全飞行的轨道高度就有上限。
But while higher is better from a fuel conservation perspective, there is an upper limit on how high it is safe to orbit humans for long periods.
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