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VOA慢速英语:美国宇航局2020年火星计划为人类进入深空做准备
2020-01-06来源:和谐英语
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mission – n. a task or a job that someone is giving to do
sediment – n. material like stones and sand that is carried into water by water or wind
trace – n. something, like an object, which shows that someone, or something, was in a particular place
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