There are four categories of figure skating: men's singles,women's singles, pairs,and ice dancing.

VOA: special.2010.02.10

And step four is going to have us figure out how many bonding electrons we have, so we have 16 minus 10, is going to be 6 bonding electrons.

而第四步需要判断,我们有多少个成键电子，那么我们有十六减十，也就是六个成键电子。

麻省理工公开课 - 化学原理课程节选

Now,some people still try to figure out that you've got four.

有些人还在试图弄清楚。

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