去年夏天以来，Crane看到13个资产管理公司在他们的证券组合里购买证券或者采取其他方式去阻止资产价格下滑。

Since last summer Crane has seen 13 asset-management companies buy securities from their portfolios or take other actions to prevent a share-price decline.

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Finally, I just want to say, next lecture is January twenty-eighth and we're going to talk about portfolio diversification, which is one very important application of the fundamental principle of risk management, as applied to securities.

最后，我想说下一讲是在1月28日,到时我们会谈谈资产组合多样化，这是风险管理基本原则中,对证券投资来说，这是非常重要的一项应用。

耶鲁公开课 - 金融市场课程节选