But right now I am going to give it to you as Mendeleev enunciated it. Atomic number, we will learn later, is the improvement.

但是现在我就要告诉你们,门捷列夫发表了它，原子序数，我们之后会学到，那是很大的进步。

麻省理工公开课 - 固态化学导论课程节选

But once we got to the atomic size scale, what happens is we need to be taking into account the fact that matter has these wave-like properties, and we'll learn more about that later, but essentially classical mechanics does not take that into account at all.

但一到到了原子尺度量级，我们必须考虑到物质,这时候有波动性质,关于这点我们今后将会学到更多,但本质上经典力学并,没有考虑这个性质。

麻省理工公开课 - 化学原理课程节选

Later on, we'll learn that hydrogen as we typically encounter it is H2, the molecule.

之后我们知道,氢气是H2，是一个分子。

麻省理工公开课 - 固态化学导论课程节选