旋梯，通常是围绕一根单柱布置，俯视面呈圆形，其平台和踏步均为扇形平 面，踏步内侧宽度很小，并形成较陡的坡度。由于其流线造型美观、典雅，且节省空间而受欢迎。
n. caracole
misc. winding stair
Toyabe博士把这个系统比作在螺旋梯上的皮球。
Dr Toyabe likens the system to a ball on a spiral staircase.
绕着光涡旋的黑暗中心，光束携带的能量流就像螺旋梯，沿着顺时针或者逆时针方向流动。
Around the dark core of an optical vortex, the energy flow carried by the light beam is like a spiral staircase, flowing in a clockwise or counterclockwise direction.
城堡里的螺旋梯总是按顺时针方向盘旋上升。因此沿楼梯爬上来进攻的剑客，其右臂都会靠着中心柱。
Any swordsman climbing the stairs in an attack would therefore have his right arm against the central pillar.
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