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A butterfly's wings might create tiny changes in the atmosphere that ultimately cause a tornado to appear (or prevent a tornado from appearing).The flapping wing represents a small change in the initial condition of the system,which causes a chain of events leading to large-scale phenomena.Had the butterfly not flapped its wings,the trajectory of the system might have been vastly different.
如果楼主需要表达上句意思 添加AFRICA 以及TX的地名就可以了
刚刚在图书馆帮你找了一下 还有一些其他的不知道还有用不 先写这一段吧