我也希望能阅读到更多的由许多第三方程序设计人员使用的设计软件方面的内容——例如，一个公共的图书馆、网络服务或者API平台。
I would also have liked to read more about designing software intended for use by many different third-party programmers — for instance, a Shared library, Web service, or platform API.
例如，这个解决方案的微分方程是一个功能。
For example, the solution of a differential equation is a function.
如果一个或多个基础方程是非线性的，例如在应用二极管的场合，那么整个系统也就成了非线性的。
If one or more elemental equations are nonlinear, as is the case for a diode, then the overall system is nonlinear.
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