Earth, The planet where we live. 地球, Mars, The red planet that the rover visits. 火星, rocket, A vehicle that carries things into space. 火箭, rover, A robot vehicle that explores a planet. 探测车, planet, A large, round object that moves around a star. 行星, rock, A hard piece of natural material from the ground. 岩石, travel, To go from one place to another. 行进;旅行, land, To come down onto the ground. 着陆, explore, To look around a place and learn about it. 探索, camera, A tool that takes pictures. 相机, wheel, A round part that turns to help a vehicle move. 车轮

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