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。
The crack is re-sampled by the skeleton and calculate via vertical direction of the tangent direction of the point on skeleton.
如果没有提供宽度参数，那么将自动根据注释参数本身计算相应的宽度（strlen(a:comment)+2）。
If no width argument is given, the appropriate width is autocomputed from the comment argument itself (strlen(a:comment)+2).
一旦确定了赋值区域的位置和宽度，剩下的就是遍历范围中的行并相应地执行重新格式化。
Once the location and width of the alignment zone have been determined, all that remains is to iterate through the lines in the range and reformat them accordingly.
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