在这里，是三维区域上的积分。

Here, you integrate over a three-dimensional region.

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在保证三维区域图绘制质量的同时，解决了速度和消隐的矛盾。

The conflict between speed and hiding is solved, and at the same time the drawn quality of three dimensional area-graph is ensured.

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研究具有变动边界的三维区域上的非线性双曲型方程的初边值问题。

The initial boundary value problem for nonlinear hyperbolic equation in three dimensional domain with moving boundary is studied.

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