电影蝴蝶效应中开头的英文是什么（大致是蝴蝶效应的解释）

原文是
It has been said that something as small as the flutter of a butterfly’s wing can ultimately cause a typhoon halfway around the world.----Chaos Theory
混沌学中有这样的说法：在南美有一只蝴蝶扇动翅膀,可能导致北半球的一场飓风.人们称之为“蝴蝶效应”.