When I reached for one of the two glasses left on the table, Tom stopped my arm.

VOA: special.2009.07.04

So, here we have a picture of Dmitri Mendeleev, who is one of the scientists responsible for first compiling the periodic table.

这是一张德米特里？门捷列夫的画像，他是最早制作,元素周期表的科学家之一。

麻省理工公开课 - 化学原理课程节选

If you look up in the corner of your Periodic Table on one of the sides, they have actually tabulated this for you.

你认真看一下角落上,在一个角落，应该已经为你们把数据列成表了。

麻省理工公开课 - 固态化学导论课程节选

Similarly we see as we go down the table, so as we're going from one row to the next row, so, for example, between helium and lithium, we see a drop; the same with neon to sodium, we see a drop here.

同样地，我们来看看沿着周期表往下走，当我们从一行到下一行时，比如，从氦到锂，我们看到了一个下落;,从氖到钠也一样，我们看到这里有个下落。

麻省理工公开课 - 化学原理课程节选