So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.

所以我们来对屏蔽举两个例子,如果我们在讨论氦，举例来说一个氦原子核或者氦原子。

麻省理工公开课 - 化学原理课程节选

Just to give you an example, here's one list, 1 2 4 30 3121724 Here's another list, 12430.

举个一例子来说，一个列表：3，12，17，24，另一个列表：

麻省理工公开课 - 计算机科学及编程导论课程节选

So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

麻省理工公开课 - 化学原理课程节选