All right. So formal charge can actually help us out when we're trying to decide between several Lewis structures that look like they might be comparable in terms of which might be the lower energy or the more stable structure.

好的，形式电荷真的可以,帮助我们决定,在几种路易斯结构中,哪个更可能符合能量更低,或者结构更稳定的要求。

麻省理工公开课 - 化学原理课程节选

And, likewise, there will be a test running from 1:05 to 1:55: two different tests of comparable difficulty. I did this last year, and the difference in the scores on all three tests 1% was less than 1%.

还有，测试的时间会是,从1点5分到1点55分，两个不同的测试,但是难度差不多，我去年这样做过，3个测试的分数的区别,不到。

麻省理工公开课 - 固态化学导论课程节选