The coordinate value of corresponding profile may be obtained quickly so long as the length of the chord of arbitrary oblique section is computed, without solving the complex equation of the surface.
只要算出任意斜截面的弦长，就可以很快地得到对应外形的坐标值，而无需求解复杂的曲面方程。
2
The macro profile and physicochemical examination of the tread oblique crack shows that the crack falls into the category of rolling contact fatigue type.