针对模型的特点及其边界条件用差分法分别进行了数值计算，结果表明陷落柱氡气场的空间形态分布特征。

The numerical computations have been made using difference method for difference characteristics and boundary conditions. The computation results show the state features of radon field in space.

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本文运用差分法求解了聚焦超声加热的二维稳态温度场，比较了声场与温度场的特征，分析了耦合层厚度与治疗区大小、位置的关系。

Characteristics of sound field and temperature field, and the relation between the width of coupling layer, the size and the position of treated area are presented.

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因此，通过不同环境的试验得到雷达图谱特征，并利用二维时域有限差分法对其进行正演模拟。

Thus, we obtained characteristics of radar images by experiments in different environment, and implemented forward modeling using two-dimension finite difference time domain method.

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