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VOA慢速英语:美国批准无人机送货
2021-01-02来源:和谐英语
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delivery – n. the act of taking something to a person or place
routinely – adv. done very often
sector – n. an area of an economy : a part of an economy that includes certain kinds of jobs
remote – adj. capable of being controlled from a distance: connected to a computer system from another place:
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