Another commonly used technique, finite element method, is able to handle no-flux boundary condition naturally.

另一种常用的方法称为有限元法，这种方法可以很自然地处理零流边界条件。

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We introduce a new method in the chapter 2 which can implement no-flux boundary condition in arbitrary geometries.

我们在第二章介绍了一种新的算法，可以在任何几何形状的边界上实现零流条件。

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