"Our largest concern is aluminium and aluminium oxides interacting with the ozone layer," Wing says.
"It's much more likely that you win the lottery than that you get impacted by this piece of space debris," Stijn Lemmens, a senior analyst at the European Space Agency, said.
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都说“高手在民间”，如何让散落在民间的中医绝活“登堂入室”？如何让有一技之长的民间高人脱颖而出？
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* 序列: 1, 5, 19, 41, 109, ...
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