So to figure out bonding electrons, -- what we take is that number 18, which is our total number of electrons we need to fill valence shells, and we subtract it from our number of valence electrons, which is 10.

那么为了找出成键电子，我们将十八，也就是填满所有价壳层,所需要电子的总个数，减去我们所有的价电子的个数，也就是十。

麻省理工公开课 - 化学原理课程节选

There were probably a number of firms that, over that ten-year period, went out of business.

在这10年间,可能有很多企业已经破产

耶鲁公开课 - 金融市场课程节选