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VOA慢速英语:俄罗斯首发卫星60年太空计划仍挣扎

2017-10-09来源:和谐英语

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Words in This Story

artificial –adj. not natural, made by people

sphere –n. a completely round object with depth, width and height

modified –adj. changed in some way from its first state or version

reputation –n. the opinion that people have about someone or something

alternative –n. something that represents a choice among more than one possibilities

3-D printer –n. a device that is able to create objects with three dimensions: length, width and height