1. 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. 
   在一个太空飞行似乎已基本成为常规作业的时代，人们很容易忽视乘火箭飞行的危险性和在恶劣的地球外层空间遨游的难度。

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