And what we've been talking about with all of these properties are, of course, how can we figure out what that is for a certain atom by looking at the periodic table, so we want to think about the periodic trend for atomic radius.

对于我们讲过的这些性质，我们所讨论的一直都是,当然是，我们如何能够判断某一个原子的这些性质,通过观察周期表，因此我们需要思考一下原子半径的周期性规律。

麻省理工公开课 - 化学原理课程节选

What he invented was an insurance policy that had a cash value and that's another-- it's a cash value on the insurance policy.

他创造了一种保单,这种保单具有现金价值,指带有储蓄性质的保单所具有的价值

耶鲁公开课 - 金融市场课程节选

And what he did what he actually grouped things in terms of their chemical properties.

他所做的，实际上他是根据元素的化学性质,来对它们进行归类的。

麻省理工公开课 - 化学原理课程节选