The comparable speed from the Moon is only 1.5 miles per second
1. The comparable speed from the Moon is only 1.5 miles per second.
而从月球出发的相应速度史是每秒1.5英里。
2. Because the gravity on the Moon's surface is only a sixth of Earth's (remember how easily the Apollo astronauts bounded along),
由于月球表面的重力仅是地球表面的1/6 -- 还记得阿波罗飞船中的宇航员累松地跳跃 --
3. it takes much less energy to accelerate to that 1.5 miles per second than it does on Earth.
在月球上加速到每秒1.5英里比在地球上所用能源要少得多。
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