Without a way to get large payloads to the Martian surface, even more ambitious plans, such as a sample return (let alone extraterrestrial car commercials), are stymied.

• 如果没有找出方法可以将大量的载重运送到火星地表，即使有再多雄心壮志，例如取回样本的计画（更别说是地球外的汽车广告了）都会充满阻碍。