So, what we're going to define is just let's just capture 90% of that electron density.
所以,我们所定义的,只包括百分之九十的电子密度。
Almost ninety percent of the university is all white, all male.
几乎百分之九十的大学生都是白人,都是男的。
Ninety-percent of all the books that were published before Peter were devotional texts in the church.
彼得之前的百分之九十的书籍,都是教堂里的祈祷文
In 1665, 93% of the people that died in that year died of infectious diseases.
在一六六五年死亡的总人数中,百分之九十三都是死于感染性疾病
So we're not saying it's all the electron density, it's just 90%.
因此我们并没有说所有的电子密度,而是百分之九十。
You better believe it's sixty to seventy percent, and the further back you go in American history the closer it is to ninety and ninety-five percent.
你最好猜百分之六七十,要是你以后有机会学习美国历史的话,你会发现它在百分之九十到九十五之间
And one common way to think about it, is to think about the value of r, or the radius, below which 90% of that electron density is going to be contained.
而通常的想法,是想象,r,的值,也就是半径的值,即有百分之九十的电子密度,都落在这个范围之内。
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