一段时间后，越来越多的银行发现自己原来认为是安全的证券都被“污染”了，它们之后被称为有毒资产。
As the year went on, more Banks found that securities they thought were safe were tainted with what came to be called toxic mortgages.
边际家庭贷款被包装成自以为安全的证券。
Marginal home loans were packaged into supposedly safe securities.
对那些战战兢兢的投资者来说，这种证券工具能为美国抵押信贷市场提供一个更加安全的方向。
For jittery investors, these are instruments that offer safer exposure to America's mortgage market.
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