Better still, in an SVG editor, you can draw both the areas (an area is a closed path), the open eye and the closed eye, keeping the latter transparent.
更妙的是，在一个SVG编辑器中，可以同时画两个区域(一个区域就是一个封闭路径)：睁眼和闭眼，并让后者透明。
If you have a quantity which is constant over any closed path, that quantity is a thermodynamics state function.
如果有一个物理量，对任何闭合回路积分是常数，这个物理量就是一个热力学态函数。
Set the Pen Tool (P) to Paths in the options bar, then draw a closed path to encompass the model as indicated in yellow.
选择钢笔工具（P），路径模式，画一条如图中黄线所示的封闭的路径将模特包住。
For inspecting topological and geometrical unanimity of a solid model, principle of closed path topology and Euler′s formula are important tools.
闭路拓扑原理和欧拉公式是检验实体模型边界表示的拓扑与几何一致性的重要工具。
For inspecting topological and geometrical unanimity of a solid model, principle of closed path topology and Euler′s formula are important tools.
闭路拓扑原理和欧拉公式是检验实体模型边界表示的拓扑与几何一致性的重要工具。
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