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Lifting heavy spacecraft and fuel out of the Earth's gravity is expensive.
将沉重的航天器和燃料送出地球引力以外费用昂贵。
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A heavy truck with a low center of gravity will hug the road.
重心低的载重型卡车会平稳行驶。
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A heavy truck with a low center of gravity will hug the road.
重心低的载重型卡车会平稳行驶。
youdao