reentered asteroid development gold y4 exploration using covid19 space shenzhou heavenly extravehicular second 每日一词神舟十五号载人飞船 探日卫星夸父一号首次发布科学图像 craft 编辑yaning missions hard meters modules construction orbiting sichuan 每日一词天问二号任务 tianzhou4 wenchang living carrier heo

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