褶皱是指穿过指纹脊线和谷线的不规则条纹。
The crease is a kind of stripes irregularly crossing ridges and valleys in the fingerprint.
当偏振光投射到手指上时，指纹的脊线将反射了光的一个偏振态，同时脊谷反射另一个偏振态。
When light hits a finger, the ridges of the fingerprint reflect one polarization of light, while the valleys reflect another.
沃特·海姆称帕克夫妇画上的两个最明显的指纹，几乎可以精确的相互叠加：形状相同、力道相通，脊线模式相同。
Yet the two most visible fingerprints on the Parkers' painting, Wertheim says, were virtually exact overlays of each other: the same shape, the same pressure, the same ridge patterns.
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