Helix Nebula(NGC 7293)【天】;spiral nebula【天】
螺线层
spiral layer【气象】
暂无补充释义。
相关词条
spiral
relational spiral
insulator with spiral arcing horns
hamulus of spiral lamina
generating crown gear， spiral toothing planning
lamina spiralis ossea【解剖】;osseous spiral lamina【解剖】
spiral slide fastener made of wire spiral