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隐私概述
语言学院 铁尔-格尔德兰 荷兰 13岁 4 / 2 英语 其他地点
A slingshot on Earth that slings spaceships into space and helps to save on fuel for longer travel to farther planets or other celestial bodies. The same rockets can be used, but since take-off is the most fuel-demanding part of the journey, a lot of fuel can be saved and used for the journey itself