股价暴跌:stocks dive/plunge/fall/drop/plummet/tumble

　标准普尔信用评级:Standard & Poor's credit rating

　　降级:downgrade 债务危机:debt crisis

　　削减财政赤字:cut the fiscal deficit

　　国库券:Treasury bond

　　经济衰退:economic recession

　　恐慌抛售:panic sell-off