“天问一号”花了大约七个月的时间才到达火星。
火星和地球距离最近时，宇宙飞船从地球到达火星要大约8个月的时间。
It takes a spaceship about eight months to reach Mars from the earth when the two planets are closest to each other.
随着时间，到达火星最乐观也需要五千亿美元。
An optimistic bill to get to Mars would come to half a trillion dollars over time.
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