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

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