?????????????????

??2?????15??????????? ?,???????14??????????,????????????(NTSB)????????????????????????,??????????????,???“?”???,???????????????????????“?????”?

??,1??????29???,?“????”?,????,??????????,?67??????????????

????????????14???,“?????????????????????”?????,??,?????????????????

??????,???????????,??“??”??????????????????????,????????????????????????????????????????,???????,???

?????,??,??????“???”?????,????????????????????,“???????”????

??,????????????????“??”??????????????????,??,?,??

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

?????,??????278???????(85 ??),?????????????,??,“???”