a. 螺旋状的, 蜗牛壳状的, 回转式的

n. 螺旋体, 螺旋面

a. Spiral; curved, like the spire of a univalve shell.

a. Shaped like a snail shell; pertaining to the Helicidae,

or Snail family.

n. A warped surface which may be generated by a straight

line moving in such a manner that every point of the line shall have a

uniform motion in the direction of another fixed straight line, and at

the same time a uniform angular motion about it.