The Butterfly Effect is the reason.
原因是蝴蝶效应。
新概念英语第四册 Lesson 14 The Butterfly Effect

📚 句中词汇解析

从本句中提取的重要词汇

effect [ɪ'fɛkt] 词频1 词根: fac
n. 影响;效果;印象;所有物; vt. 使发生;引起;产生（效果）;
💡 ef出+fect做，制作→做出来→实施；生效；效果
"the cumulative effect of human activity on the world environment"
人类活动对世界生态环境日积月累的影响
近义：implement, make, materialize, occasion, officiate, operate 反义：motive, occasioner, origin, point, reason, root
butterfly ['bʌtɚflaɪ] 词频2
n. 蝴蝶;蝶泳;轻浮的人;游手好闲的人; v. 切开摊平;
💡 苍蝇（fly)染上黄油(butter)变成 蝴蝶
"She's like a butterfly. She flits in and out of people's lives."
她像一只蝴蝶，每天在人前人后飞来飞去。
近义：miss, babe, skirt, canary, coed, cupcake
reason ['rizn] 词频1 词根: 思考
n. 理由;原因;理性;理智; vt.& vi. 推理，思考;争辩;辩论;向…解释;
💡 再（re）生一个（a）儿子(son)， 理由是第一个儿子夭折了
"The reason for the flood was that heavy rain."
水灾是那场大雨造成的.
近义：ratiocinate, think, conclude, deduce, deduct, motivation 反义：idiocy, applesauce, imbecility, inaccuracy, inanity, mistake

📚 更多「新概念英语第四册」例句

Let us get down to fundamentals and agree that the young are after all human beings -- people just like their elders.
承认青年人和他们的长辈一样也是人。
the waters flow more quietly, and in the end, without any visible break,
河水流得平缓起来，最后连绵不断地
But, of the vertebrates, unpredictable Nature selected only snakes (and one lizard).
不过，当它们相互撕打时，毒液就成了利弊参半的武，可以杀死对方，也可以被对方的毒液杀死。
The mammoth has now been restored in the Palaeontological Museum in Leningrad. Other animals were trapped in tar pits, like the elephants, sabre-toothed cats, and numerous other creatures that are found at Rancho la Brea,which is now just a suburb of Los
这头长毛象已被修复，现存于圣彼得堡古生物学博物馆。有的动物掉进天然沥清坑里被保存下来，如在兰桥。拉。布里 -- 现在是洛杉矶的郊区发现的大象、剑齿虎和许多其他动物。
But, in contrast, it is only in modern times that Galileo has become a problem child for historians of science.
但是相比之下，只是在现代对于科学史家来说，伽利略才变成一个新的难题。
Two assistants, mounted on tame elephants, control the captive from either side,
两位助手骑在驯服的象的背上，从两侧控制新捕的象，