漫射光色反射从一个方向来的光，因此对于径直照射的表面来说就比仅是光线斜射过的表面更为明亮。
Diffuse color reflects light that comes from one direction, so it's brighter if it comes squarely down on a surface that if it barely glances off the surface.
在光弹性贴片法中，通常利用剪应力差法和斜射法来分离主应变。
In the photoelastic coating methods, the shear stress difference and slant incident approaches are often used to divide the main strains.
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