And to update the velocity to the new mesh efficiently but still divergence free is still a problem.

另外，将不可压的速度场从旧网格更新到新网格上，仍然要满足不可压条件是比较困难的。

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In electromagnetic media, repeate overcome the attenuation caused by free-space electromagnetic-field divergence or cable loss.

在电磁媒体中，重复克服衰减引起的空间电磁场散度或电缆损失。

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