Chinese Vocabulary摩擦frictionmócāUsage & ExplanationResistance between two surfaces.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跳板springboard系统system
