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VOA慢速英语:美国宇航局称下一次登月的将是私人公司
2018-12-01来源:和谐英语
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tangible – adj. something real that can be seen, touched or measured
rover – n. small vehicle that can move over rough ground, often used on the surface of other planets
regularly – adj. something done repeatedly or often
mission – n. a project or operation
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