Helix Nebula(NGC 7293)【天】;spiral nebula【天】
螺纹导管
spiral vessel
暂无补充释义。
相关词条
relational spiral
spiral joints
insulator with spiral arcing horns
generating crown gear， spiral toothing planning
auger bit【机】[专业]杆式取土样器\nearth auger【建】;fluted twist drill【机】;spiral drill【机】
spiral slide fastener made of wire spiral
outer spiral bundies