Here is an example that shows some very, very metallic elements, groups one and two, and some non-metallic elements over here, five, six and seven.

举个例子,这个例子表明金属元素，第一族和第二族，与一些非金属元素,在这里，第五族，第六族，和第七族。

麻省理工公开课 - 固态化学导论课程节选

I said because I knew I didn't want to have five kindergarten groups all in here.

因为我不想,5组幼儿园小朋友,都同时参加。

麻省理工公开课 - 媒体、教育、市场课程节选