So, if you can't immediately know, and you don't all have periodic tables in front of you, so that's fine, but if you have a periodic table in front of you, you need to be able to count valence electrons, so work on that if it doesn't come naturally to you in terms of figuring that out.

如果你不能马上想到，而且你手上没有周期表，那还好，但如果你面前有一张周期表，那你就得具备从中查出价电子个数的能力，如果你不能自然而然地想到,请在这方面多下点功夫。

麻省理工公开课 - 化学原理课程节选

Unsurprisingly, you've got the ability to do decent work in this class and most of you have the ability to do good work, and some of you have, a fair chunk of you have, the ability to do excellent work, though it may take some work on your part to get to that point.

不奇怪，你已经有能力去做极好的作业,并且大多人有能力做好作业，一些人有，是大部分人有，有能力去做极好的作业，尽管这需要花费一些功夫才能做到。

耶鲁公开课 - 死亡课程节选