换言之，这只基金不是在简单地跟踪次级抵押市场：它做的更好，想必是因为该基金购买的是评级较高的证券。
In other words, the fund was not simply tracking the subprime markets: it was doing better, presumably because it was buying highly rated securities.
多数投资者曾很乐于购买CDO等产品，因为他们信任信用评级的价值。
Most investors were happy to buy products such as CDOs because they trusted the value of credit ratings.
而救援计划将只购买那些原有信用评级达到AAA级的债券，这一原则就把那些最差的资产排除在外。
And the scheme will buy only securities that originally had an AAA credit rating, which rules out the nastiest stuff.
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