We're interested in shorting some of the AA tranche of CDOs.

我們有興趣買空債務擔保的AA份額。

Traders also started selling an even riskier product, called collateralized debt obligations, or CDOs.

交易员们也开始销售一种风险更大的产品，叫做债务抵押债券（CDOs）。

That compares with the $1trn market for collateralised debt obligations (or CDOs) in 2007, which were at the heart of the global financial crisis.

这与2007年1万亿美元的债务抵押债券(CDO)市场形成了鲜明对比，后者是全球金融危机的核心。