And this is just a picture showing some of these sizes with their parent. So, for example, a lithium here, you can see how lithium plus is smaller than the actual lithium atom in its neutral state.

这是一张对比图,展示某些离子与它们的母体，比如，这里是锂，大家可以看到正一价锂离子是多么的小,与中性锂原子相比。

麻省理工公开课 - 化学原理课程节选

and I asked you to give yourself a percentage rating relative to the rest of the class, then if everybody was accurate, or at least not systematically biased, the number should add up to 50%.

我要你相比于其他同学的表现，给自己一个百分数，如果大家都准确地评价自己，或者说大家都不偏心于自己，那么平均百分数应该是50%的。

耶鲁公开课 - 心理学导论课程节选