这句子一看便懂，却完全忘了状语，形式主语等东西……
【 在 zuohan 的大作中提到: 】
: Because the Moon has only an eightieth of the Earth's mass, it requires 97 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!
: 一种观点是，to travel......作目的状语  （问题是，it指代什么？）
: 另一种观点是，to travel......为真正主语，而it为形式主语
: ...................
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