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The dream of sending humans to Mars is closer than ever before. In fact, many scientists think that the first person to set foot on the Red Planet is alive today. But where should the first explorers visit when they get there? Horizon has gathered the world's leading experts on Mars and asked them: where would they go, if they got the chance - and what would they need to surviv...。当艾莉和她的父亲去希腊旅行时，她的父亲被谋杀了，她必须揭开古老的家庭秘密，将凶手绳之以法。。