The marching square algorithm is often used in the front tracing, but the algorithm has some redundancy in the calculation.
本文根据图像中曲线跟踪的特点，改进了步进方格算法，减少了其中的重复计算。
We will now start tracing the Front Face of the panel, use the Pen Tool to trace the part shown in the image below.
现在我们要开始描摹正面的前板，使用钢笔工具来描绘下图指示区域。
Because there are no links between the development and the front-end problem-tracking systems, time is wasted tracing what went wrong (Figure 1).
因为在开发和前端问题追踪系统之间没有联系，时间会浪费在处理错误上(图1)。
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