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US Proposes Rules for Commercial Use of Drones
2015-02-19来源:VOA
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federal - adj. having to do with a national or central government
aircraft - n. a vehicle that flies
civil liberties - n. the right of people to do or say things that are not illegal without being stopped or interrupted by the government
supersede - v. to take the place of (someone or something that is old or no longer useful); to replace (someone or something)
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