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VOA慢速英语:欧洲和日本联合发射的太空飞船开始为期7年的水星之旅
2018-10-29来源:和谐英语
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probe - n. a device that is used to obtain information from outer space and send it back to Earth
solar - adj. of or relating to the sun
core - n. the central part of something
elliptical - adj. shaped like a flattened circle
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