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Two scientists work together to test a geo-radar that was built to make a map of the planet Mars. They pull the flat box across rocky, sandy ground. They are wearing spacesuits, just like astronauts do in space. The bright white on their protective e
发表于:2019-01-03 / 阅读(106) / 评论(0)
2018年VOA慢速英语(二)月