It may eventually purchase commercial and residential MBSs that are not guaranteed by a GSE.

它甚至会购买那些没有GSE担保的商业与住房按揭支持证券。

The Fed has not yet bought any MBSs, but their yields have dropped from 5.45% to 3.9% since it proposed doing so.

尽管美联储尚未购入住房抵押贷款支持证券（MBSs），从公布消息之日起收益率已由5.45%下降到了3.9%。

Risky, subprime loans, were combined with top rated, prime loans, andpackaged as Mortgaged Backed Securities (MBSs).

高风险的次级贷款结合了高评级的优质贷款 打包成了“住房抵押贷款债券”（MBS）。