我们对住房贷款抵押证券评级标准作出调整，使得这些债券更难获得AAA级评级。

For instance, we have made changes to our criteria for rating mortgage securities so that it will be much more difficult for such a security to receive a triple-A rating.

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对冲基金和世界各地的银行购买债券，或债券有关的风险，在以抵押债务证券(CDO)形成不良住房贷款的支持。

Hedge funds and Banks around the world purchased bonds, or risk related to bonds, backed by bad home loans in the form of collateralized debt obligations (CDOs).

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对冲基金和世界各地的银行购买债券，或债券有关的风险，在以抵押债务证券(CDO)形成不良住房贷款的支持。

Hedge funds and Banks around the world purchased bonds, or risk related to bonds, backed by bad home loans in the form of collateralized debt obligations (CDOs).

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