The human face is the most familiar organ to us, but it is a difficult problem in the area of computer graphics to synthesize realistic human face.

人脸是我们最熟悉的器官，但真实感人脸合成却是计算机图形学领域中最困难的问题之一。

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Theory guidance function of model undeniable, imitate a certain abstract theory model difficult to solve the realistic problem.

理论模型的指导作用是不可否认的，但照搬某种抽象的理论模型却难以解决现实问题。

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The contradiction between the realistic and real-time of the shadow rendering algorithm has been a fundamental and difficult problem in computer graphics and virtual reality technology.

阴影绘制算法的真实感和实时性之间的矛盾，是计算机图形学和虚拟现实技术目前所要解决的一个基本难题。

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