;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.
地球外气层底的温
是不断变动的，不过通常约是1000K，使得氢原子平均的速
秒5公
。
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.
地球外气层底的温是不断变动的，不过通常约是1000K，使得氢原子平均的速秒5公。
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