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The first launch of Falcon 9 could change the course of human space flight.
猎鹰9号的首次发射可能会改变人类太空飞行的进程。
youdao
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But why spend money on human space flight at all?
但是，归根结底，为什么要花钱在载人航天飞行上呢？
youdao
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But why spend money on human space flight at all?
但是，归根结底，为什么要花钱在载人航天飞行上呢？
youdao