You'll see both terms used on the web, and the literature etc., and think of them as synonyms.

然后把它们当做同义词，现在类的概念。

麻省理工公开课 - 计算机科学及编程导论课程节选

When we see that, when we look on the web, we see that expression of both a hope for something better that the web seems to represent for them and we see that sense of furious anxiety about what school classroom actually means to these kids.

当我们认真看那些网站的时候，我们看到了这样一种表达,希望更好的生活,仿佛只有网络能够提供给他们,同时我们还看到了那种狂躁不安,困惑于到底学校的课堂对这些孩子们意味什么。

麻省理工公开课 - 媒体、教育、市场课程节选

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