Because the Moon has only an eightieth of the Earth's mass

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• 改错The moon has a mass that is nearly one hundred times less than the earth in consequence,the forThe moon has a mass that is nearly one hundred times less than the earth in consequence,the force of gravity at the moon'ssurface is only one-sixth
• per cent 和percent 的区别?because the moon has only an eightieth of the earth's mass,it require97 per cent 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.
• Because the Moon has only an eightieth of the Earth's mass
• Because the Moon has only an eightieth of the Earth's mass因为月球的质量是地球质量的十八分之一这里的eightieth是第十八的意思这里怎么是解释成十八分之一的呢?
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