We even took the tops off the tables to see if he had hidden the letter in the table legs.

VOA: special.2009.12.26

The room is a studio-physics room, has 13 tables, we put nine students at the table.

这种教室是物理教室，它有13张桌子，九个学生坐一桌。

麻省理工公开课 - 媒体、教育、市场课程节选

So, if you can't immediately know, and you don't all have periodic tables in front of you, so that's fine, but if you have a periodic table in front of you, you need to be able to count valence electrons, so work on that if it doesn't come naturally to you in terms of figuring that out.

如果你不能马上想到，而且你手上没有周期表，那还好，但如果你面前有一张周期表，那你就得具备从中查出价电子个数的能力，如果你不能自然而然地想到,请在这方面多下点功夫。

麻省理工公开课 - 化学原理课程节选