6.Because the Moon has only an eightieth of the Earth's mass, it requires 97% less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth's surface into orbit!
因为月球的重只有地球的1/8,因此,从月球
地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。
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