For the simple reason that the number of possible chess games is so huge, that computers can't calculate it.

原因很简单,棋局的潜在变数相当之大,以至于计算机根本无法将其完全计算出来

耶鲁公开课 - 死亡课程节选

It varies widely.

变数很大。

电脑图片的魅力 - SpeakingMax英语口语达人

Then a variant, by the way, of number one the falsifying things, is whether the record-keeping itself is reactive.

然后还有个变数要说一下,关于篡改记录,是否只是为了记录而记录

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

However, there's one other variable that you want to be aware of and that is, he knows he ought to be going straight ahead like that, but he also knows that his right flank is open.

然而,还有其他变数是必须考虑到的,那就是,士兵知道他是向前直行的,但是,他同样知道他的右路是洞开的

耶鲁公开课 - 古希腊历史简介课程节选

As a consequence, there's a lot of variability and error in these dietary measurements.

结果就是,饮食测评中会有很多变数,和误差

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选