because one of the basic rules of nature is that

因为自然界的基本规律之一指出
if you repeat a certain experiment under the same conditions,

如果你在相同的条件下重复同一个实验
you'll get the same answer.

你将获得相同的答案
That's why when I proofread anything,

这就是为什么我校对书稿
I write, I don't find any mistakes.

和写作时没有发现任何错误
But my readers are gleefully pointing out this and that typo,

而我的读者们却欣喜地指出各处的印刷错误
because we cannot detect those errors.

因为我们检查不出这些错误
That's true even for a scientific calculation.

在进行科技计算时也是一样
Because for some reason you forgot something the first time,

假如因为某种原因你第一遍做的时候忘记了什么
you'll keep making the same mistake.

你将一直犯同样的错误
That is known in the business as "chasing after π".

这就像是"追查消失的 π"
In all the calculations we do, we look at the right answer,

在所有的计算里我们看到标准答案