The business card must include at least one vector path, which may be used as a vector mask or a shape layer.

名片必须包括至少一个向量轨迹，该轨迹必须被作为向量屏蔽或成型层面使用。

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Therefore, a concept of path is fundamental to vector drawings.

因此，路径的概念对矢量作图非常重要。

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OK, so, we've seen that if we have a vector field defined in a simply connected region, and its curl is zero, then it's a gradient field, and the line integral is path independent.

一个向量场,如果定义在单连通区域并且旋度为零，那么它就是一个梯度场，并且其上的线积分与路径无关。

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