????:1??????????:????VX???

2?????????

3??????200??500

4?????

5???????????

??????????????????10???????????????29????????? ??????(NPR)??,????????????????????????????????????????“????????”????????????,????????????????????????????(Morris Brown)?????,??20????????????,????????????????????????“??”,?????????

“???”????,“???????????,?????????????????(????????????????????)???80%????,??????????????,???????????????”????????????,????????????3200?????,????????????????????????????,????????????????????????????????????

???????????????,??????,??????,????????????????????????????

??????????????????????6???????????,??????“?????,??”??????????“???????,????”???,???????20??,?????????????????,?????????????????

????????????,????????,???????????????????????????????????????????????,???????

??,??,???????????????????????????(Center for American Progress)?????????(Andrea Ducas)??:“?????”????????(George Washington University)??????????????????????????????????????????????(Jameta Nicole Barlow)???????????,???:“????”

?,??,?????????????????,??,??????????

?????20???????80??????????????????????????,????????????????6???

????????????????????(Janice Probst)???????????????????:“???????????????????????????????????????,???????????????????????????????????”????????????????????????????:“???????????????,????????????‘????’,‘?????????’?”

(???????:??????????? ?????:???????? ?????????????????????????????) ???????????:???????