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VOA慢速英语:科学家们正在研制蒸汽驱动的宇宙飞船
2019-01-17来源:和谐英语
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tremendous – adj. extremely good
propellant – n. fuel that causes something to move
expensive – adj. costing a lot of money
allow – v. to permit
potential – n. an ability that has not yet been developed
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