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1.One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.

1.地球在生命理论是基于陨在碳化合物质这一

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2.The temperature at Earth's exobase oscillates but is typically about 1,000 kelvins, implying that hydrogen atoms have an average speed of five kilometers per second.

2.地球气层底是不断变动,不过通常约是1000K,使得氢原子平均为每秒5公里。

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