.. You want to get it-- if you keep adding assets, you can do better and better on your portfolio standard deviation.

你想得到-,如果不断增加资产,组合的标准差就会越来越小。

耶鲁公开课 - 金融市场课程节选

Depending on where the assets expected returns are and the assets' standard deviations, we can see that we might be able to do better than--have a lower variance than either asset.

根据资产的预期收益,以及收益的标准差，可以看到我们有更好的选择,这里的方差值比以上两种方案都要低。

耶鲁公开课 - 金融市场课程节选