News Review: Sending a used rocket into space

source: BBC Learning English     2017年12月26日
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The story:
A Californian company's made history by launching a used rocket back into space. Traditionally rockets are used once before being scrapped. But SpaceX has developed a way of landing its boosters safely on Earth.
Key words and phrases: 
re-usable: able to be used again
launch: when a spacecraft is put into space
milestone: event which marks an important stage in a process