?????????????????
???????????????????????2??????????????????15? ?,????14??,?(NTSB)??????,??????????????????????,??“??????”??,??“??????????”?
??,1??29??,??????????????????????“?”??,?????,????????????,??67????
???14??????????????????,“?????”????,??,??????
??????,???,????????????????“?”??,???????????????????????????????,??????????????,???????????????????????
????,???,???????????“???”??????????????????,????????????????,“???????????”????????
??,????????????“???????????????”????????????,????????????,??,????
????????????,???,????????????????????,????
??,??????278???(85 ?????????????????????),????????????????????????,??????????,“????????”
?????:??