Helix Nebula(NGC 7293)【天】;spiral nebula【天】
螺旋管蒸发器
spiral pipe type evaporator
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相关词条
spiral
relational spiral
spiral joints
insulator with spiral arcing horns
spiral whorl
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】