At the same time need to enter parameters luxuriant tree, which tree recursive iterations, of course, the greater the n to produce the effect of some realistic, but with great expense of running time.

• 同时需要输入树的繁茂参数，亦即树的递归迭代次数，当然n愈大，生成效果约逼真，但是以巨大的运行时间为代价。