Recently, there is a bit of a scandal regarding these rating agencies because they gave AAA ratings to some subprime securities.
最近，出现了一点关于评级机构的丑闻，因为他们将一些次级证券评为 AAA 级。
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A "subprime borrower" is somebody who has a poor credit history or some other indication that would suggest that they might not be able to repay the mortgage.