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VOA慢速英语:美国国防部长敦促在太空研究中与巴西建立更紧密联系
2018-08-15来源:和谐英语
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hemisphere –n. half of the Earth
orientation –n. a main interest, quality, or goal
velocity –n. quickness of motion
missions –n. a task that is considered to be a very important duty
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