If you place a spiralling shell down on the table with the spiral facing up then in most shells the spiral evolves in a clockwise orientation from the centre of the shell out.
如果你把一只螺纹贝壳放在桌上，螺旋面朝上，绝大多数的螺线是顺时针方向从中心到边缘展开。
The Centre constitutes the roots of the spiral tower.
该中心构成了螺旋塔的塔根。
The Centre constitutes the roots of the spiral tower.
科学中心构成螺旋塔的根基。
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