translation.en: Because we had to go there for the Rosetta scientific objectives very far away -- four times the distance of the Earth to the sun -- and also at a much higher velocity than we could achieve with fuel, because we'd have to take six times as much fuel as the whole spacecraft weighed.
translation.zh: 因为我们得去一个十分遥远的地方 去完成罗塞塔号的 科学目标—— 是地球到太阳距离的4倍—— 而且以一个我们用普通燃料 无法达到的速度。 因为我们得携带六倍于 航天器本身重量的燃料。