The moment Richard gains some power from the use of words, his mother takes it back by exerting that power herself, taking that power away from him.

理查用唇齿周旋,母亲以彼之道,还施彼身。

耶鲁公开课 - 1945年后的美国小说课程节选

So, let's do 10 seconds on this problem here.

我们用10秒钟做这道题。

麻省理工公开课 - 化学原理课程节选

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