subprime :次贷 credit crisis:信贷危机 sell-off:抛盘 . under strain : 处于窘境 . mortgage debt :抵押债务 recession :衰退 liquidity:偿债能力,流动性. hoard cash:揽现 meltdown:萧条,彻底垮台. short-term Treasuries :短期国债 credit crunch:信用紧缩. plummet:直线下降: hedge fund: 套利基金;避险基金. stimulus:刺激(方案) rate cut:利率下调