You will get some sort of mesh grid on your surface and you will look at a little parallelogram that is an elementary piece of that mesh and figure out what is its area and normal vector.

在曲面上做一些网格，你会看到一个网上的每一小块儿，都是小的平行四边形，我们要弄清楚它的面积和法向量是什么。

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The governing equations are discretized on uniform grids using the FiniteDifference method, and a double grid method is used for the mesh slice to save the time.

采用基于均匀网格的有限差分离散控制方程，为了节省时间，在网格剖分时还采用了双重网格法。

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Hence, these local and parallel algorithms only involve one small original problem on coarse mesh and some correction problems on local fine grid.

因此，这种局部和并行算法仅仅涉及一个粗网格上的整体逼近和细网格上的局部校正。

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The big idea: putting sensors everywhere that communicate in a mesh network and allow real-time tracking and optimization of everything from traffic to the power grid to the water supply.

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