And we must know what the result is supposed to be. Typically when you run an experiment, you say, and I think the answer will be x.

这样我们可以来查看代码的进程,我们还必须清楚结果应该是怎么样的，比如当你运行一个实验的时候。

麻省理工公开课 - 计算机科学及编程导论课程节选

This is so obvious in this problem, but when you see more complicated formula, you may not know all the assumptions that went into the derivation and quite often you will be using it when you shouldn't.

在这道题中这些都很明显,但是当我们用更复杂的公式时,你可能搞不清楚所有,在推导时的前提,因此很多时候,你都会用错公式

耶鲁公开课 - 基础物理课程节选

Another thing I want to point out about every sigma orbital that you see, and it will make more sense when we contrast it with pi orbitals later.

另外一个我要指出的事情就是,关于每个sigma轨道你能看到,当我们把它和π轨道对比的时候会看的更清楚。

麻省理工公开课 - 化学原理课程节选