慢速英语:中国天问一号火星探测器发射成功

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spacecraft - n. a vehicle designed to fly in outer space

mission - n. a goal or a serious undertaking

probe - n. a vehicle that explores a planet's service

solar-powered - adj. something that draws its power from the sun

light-years - n. a unit of measure used to explain astronomical distances

constellation - n. a group of stars that appear to form pattern