此前一大批住房抵押贷款支持证券都获得了包括AAA的最高信用评级，虽然事实证明并非如此。
A large number of these securities received the highest credit ratings, including AAA, but proved to be anything but safe.
本周一家面临资金困难资产公司-Thornburg，，以9-95折销售了200亿美元最高信用评级的债券。
This week Thornburg, a property firm facing funding difficulties, sold an array of top-notch securities worth over $20 billion at a 5-10% discount.
信用评级的范围从最高的AAA级到最低的D级。
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