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为登火星做准备 NASA碟形登陆减速器测试再遇挫 After several weather related delays,the world's largest helium balloon was launched from a military base in Hawaii to test a saucer-like device called the Low-Density Supersonic Decelera
发表于:2018-12-16 / 阅读(48) / 评论(0)
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My name is Hua Fei and I am a sporting robot of the 23rd century. I am an expert at high flying exercises. I jump from spaceships and as I fall I turn, dive, circle and dance until I softly land as close as I can to the finishing line. Robot competi
发表于:2018-12-29 / 阅读(166) / 评论(0)
高中一年级英语