;
文;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.
地球外气层底
温度是
断变动，
通常约是1000K，使得氢原子平均速度为每秒5公里。
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.
地球外气层底温度是断变动，通常约是1000K，使得氢原子平均速度为每秒5公里。
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