原级：fray
frays
现在分词：fraying
过去分词：frayed
过去式：frayed
1. \u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD
1. The census data depict a middle class that is shrinking as unemployment stays high and the government's safety net frays.