n a plane curve traced by a point circling about the center but at increasing distances from the center
n a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle
n a continuously accelerating change in the economy
n ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center
n a structure consisting of something wound in a continuous series of loops
n flying downward in a helical path with a large radius
v to wind or move in a spiral course
v form a spiral
v move in a spiral or zigzag course
n. 螺旋（线）( spiral的名词复数 ); 螺旋式的上升（或下降）
v. 盘旋上升（或下降）( spiral的第三人称单数 ); （物价等）不断急剧地上升（或下降）