用VRML编写的一个大型广场，包含能飞的飞机，会响的大本钟，旋转风车，草坪，自由女神，凯旋门等，有天空，可多角度观测-A large square, written in VRML contains can fly a plane, will ring of Big Ben, rotating windmill, lawn, the statue of liberty, etc., the arc DE triomphe sky, multi-angle observation

利用R语言生成windmill图，用于复杂网络仿真和分析(A windmill graph generated by R language)