The next step is to declare the entry point -- the main() method, shown in Listing 4

下一步是声明入口点 —— main() 方法，如清单 4 所示

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Up to that point, chapters 1 through 4 cover the general scientific method, experiment and observation, and simple systems and definitions.

到现在为止，第1章到第4章介绍了一些通用的科学方法、实验和观测，以及一些简单的系统和定义。

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Integral equation method is used to calculate the scattering of the surface waves in chapter 5. Different from the chapter 4, this method can handle the situation of the point sources.

第五章采用积分方程法研究面波的散射，和第四章的不同在于，我们利用此方法可以分析三维非均匀体对不同点源激发的面波的散射。

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