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。
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.
这种生物头上伸出带刺的肢体，扁圆形的嘴巴就像照相机的光圈一样开开合合。
But the fossil creatures had spiny limbs sprouting from their heads and circular, plated mouths, which opened and closed like the diaphragm of a camera.
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