First it marked out a race-course, in a sort of circle, ('the exact shape doesn't matter, ' it said, ) and then all the party were placed along the course, here and there.
首先，它划出个比赛路线，有点像个圆圈，它说：“具体形状没关系的。”
One of the problems that has never been solved is that of "squaring the circle." This really means to find the exact area of a circle.
一个一直没有得到解决的问题是，怎样“求圆的面积”。这个问题的真实意思是：求一个圆的精确面积。
By focusing a circle of light on the cornea and measuring its reflection, it is possible to determine the exact curvature of the cornea's surface.
通过将一束圆形光圈聚焦在角膜上，测量反射过来的光线，就能得出角膜表面曲率的确切数据。
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