If someone does something bad to you, you should not do the same to him.

VOA: special.2009.07.26

I know this is a simple example, but when you mature as a programmer, one of the first things you should do when you sit down to tackle some problem is write something like this pseudo code.

我知道这是个很简单的例子，但是当你们成长为一名程序员后，当你们碰到问题后第一件事情就是,该写一些类似于,伪代码的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

that something you that you either did or did not do but should have done.

为一些你之前做过的或是本该做却没有做的事情表示遗憾。

I should have 课堂 - SpeakingMax英语口语达人

But,I believe you should never criticize others for something you would do yourself.

VOA: special.2010.05.09

So this should be something you can do pretty quickly, so let's take 10 more seconds on that.

你们应该很快就能做出来，再给你们10秒钟。

麻省理工公开课 - 化学原理课程节选

but rather when you're telling somebody that they should or should not do something.

而是用于告诉某人他们应该做或者不应该做某事。

I'm sure 课堂 - SpeakingMax英语口语达人