渐开面包络环面蜗杆的英文

toroid enveloping worm with involute helicoid generatrix

• 渐:    gradually; by degr ...
• 开:    open; turn on; swi ...
• 面包:    bread
• 络:    net-like things
• 环:    ring; hoop
• 面:    face
• 蜗杆:    worm; endless scre ...