CSS Ninjas appears to use flat colors at first glance, but each colored area has a subtle gradient, which gives it texture.
一眼看去，CSS Ninjas似乎使用的是平直颜色。不过其实每个色彩区域都有微弱的渐变，创造出迷人的材质效果。
Add Gradient Overlay to avoid flat color and Bevel and Emboss to give it three-dimensional appearance.
添加渐变叠加，以避免平面色彩和斜面和浮雕，给它的三维外观。
A new algorithm to evaluate to gradient of measured flat related to datum flat is presented in this paper.
提出一种评定平面对平面倾斜度误差的新算法。
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