“多有趣的一天！”是否这两种都可以?。

How fun a day it is!

youdao

你用信用卡付款还是现金付款，两种都可以的。

Would you buy it on credit or cash ? You can do either.

youdao

有两种资格证明—任何一种都可以接受。

There are two types of qualification—either is acceptable.

《牛津词典》

So, these are two different definitions of how to think about atomic radius, but really what you find when these are measured is they come up with almost the identical values, so there are tables, you can look up of atomic radii and see these values, and you can trust them that, they work for both this definition and for this definition here, in most cases.

这就是,关于原子半径的两种不同的定义，但实际上你会发现按照这两种方法,测量出的值是相等的，因此有很多关于原子半径的表格，你可以通过查阅它找到这些值，你可以相信这些值，它们对于这两种定义都是适用的，在大多数情况下。

麻省理工公开课 - 化学原理课程节选