它像一架飞机一样起飞和着陆，也可以向火箭一样飞进外层空间。
It was to take off and land like a plane, but soar into outer space like a rocket.
你能告诉我为什么火箭能够飞入外层空间吗？
在太空飞行似乎已基本成为常规作业的时代，人们易于忽视乘坐火箭飞行的危险和在险恶的地球外层空间飞行的难度。
In an age when space flight has come to seem almost routine, it is easy to overlook the dangers of travel by rocket, and the difficulties of navigating the fierce outer atmosphere of the Earth.
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