The crack is re-sampled by the skeleton and calculate via vertical direction of the tangent direction of the point on skeleton.
通过骨架对裂缝二次采样，沿骨架点切线方向的垂线方向求出相应的宽度。
All satellite image are tangent plane projection obtained along the flight direction of satellite.
卫星图像都是沿卫星飞行方向而获取的切平面投影图像。
Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.
由切应力互等定理可知，在截面边缘上各点处切应力方向必与圆周相切。
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