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[胡敏读故事记托福单词] 胡敏读故事记托福单词 第179期:采矿者和火箭推进器 The prospectors an
不管怎样,他们必须使推进器的重量和火箭的重量保持一定的比例,否则的话就会缺少足够的推进力,甚至无法离开地面了。2016-06-14 编辑:mike
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2016-06-14 编辑:mike