第一次的外层空间飞行震惊全世界。
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.
两个宇宙飞行器在外层空间对接并交换宇航员。
The two space vehicles docked in space and exchanged astronauts.
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