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VOA慢速英语:美国军方希望实现太空加油和补给
2018-08-14来源:和谐英语
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caboose - n. a part of a train that is attached at the back end and is used by people who work on the train
globe - n. the earth
habitat - n. the place or type of place where a plant or animal naturally or normally lives or grows
hypersonic - adj. relating to speeds of more than five times the speed of sound
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