Helix Nebula(NGC 7293)【天】;spiral nebula【天】
螺旋锥齿轮铣刀盘刃磨床
spiral bevel milling cutter head sharpening machine
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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