Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.

球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。

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WOMAN IN THE MIRROR: A woman looked in a mirror, and into a camera, as she put on makeup at the African Cup of Nations soccer center in Luanda, Angola, Wednesday.

镜中的妇女：周三，安哥拉，罗安达。

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When viewed from above, the circular top with a glass dome in the center looks like a huge bronze mirror of the Han Dynasty.

从高处俯瞰，上海博物馆的玻璃圆顶犹如一面硕大的汉代铜镜。

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It was as if a mirror had been placed in the center of the plane to remind us all of our humanity.

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Marco Iacoboni, a lab director at the UCLA Brain Mapping Center, says when people see a smile, so-called mirror neurons fire in their brain and evoke a similar neural response as if they were smiling themselves.

WSJ: Stress-Busting Smiles