The point is that breaking free of Earth's gravity will no longer require so much energy — perhaps 100 times less than launching the space shuttle.
最主要的是，摆脱地球引力将不再需要那么多的能量——也许还不到发射航天飞机所需能量的1％。
The point is that breaking free of Earth's gravity will no longer require so much energy — perhaps 100 times less than launching the space shuttle.
最主要的是，摆脱地球引力将不再需要那么多的能量——也许还不到发射航天飞机所需能量的1％。
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