Chinese Vocabulary系统systemxìtǒngUsage & ExplanationA connected set of parts.Hear It in ContextThis word appears in 1 episode:Fifty-Four Years Later, Humans Return to the MoonmediumRelated Words等离子体plasma低地球轨道low Earth orbit飞船spacecraft隔热罩heat shield降落to land竞争competition历史性historic摩擦friction跳板springboard
