美联储所接受的最低质量的抵押都是AAA级别的私人房屋抵押债券，它们都不在被降级检查的行列。
The lowest collateral the Fed will accept is AAA-rated private mortgage-backed bonds that are not on review for downgrade.
单单九月份就有120万套单元房开工了，比美国去年开始建设的私人房屋数量的两倍还多。
In September alone, work began on 1.2m units-more than twice the number of private homes America began building last year.
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