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代码说明：

知名游戏《模拟城市》（SimCity）公开了源代码，采用的是GPLv3许可证。由于版权方面的考虑，开源版本的《模拟城市》改名为 Micropolis，这正是它最初的开发代号。获得了《模拟城市》商标的持有者EA同意后，OLPC可以在XO笔记本上使用SimCity这一名称。负责《模拟城市》更新和维护的Don Hopkins为XO版本进行一些很cool的改动，程序也从最初的C代码换成了C++和Python。可以到这个网址下载所有不同版本的源代码。-Well-known game " Sim City" (SimCity) source code public, using the GPLv3 license. Because of copyright considerations, the open source version of the " Sim City" was renamed Micropolis, which is code-named its initial development. Access to the " Sim City" the holder of trademark EA consent, OLPC can be used in the XO notebook the name SimCity. Responsible for " Sim City" to update and maintain the XO version of Don Hopkins for some very cool changes, the program from the original C code into a C++ and Python. Can go to this website all the different versions of source code.