搭乘超音速飞机飞行会成为21世纪常见的旅行方式。
Supersonic flight could become a routine form of travel in the 21st century.
飞行安全自从20世纪70年代的急剧发展以来还没有得到改善。
Air safety has not improved since the dramatic advances of the 1970s.
在18世纪，飞行被认为是不可能的。
20世纪发明的空中飞行似乎使世界变小了。
The innovation of air travel during the twentieth century has made the world seem smaller.
20世纪发明的空中飞行似乎使世界变小了。
The innovation of air travel during the twentieth century has made the world seem smaller.
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