??????2,??????2????????????,??????2?????????????
??????????????ξ??е????????????????????????????
?????????ж?ι??? ????????????????? ??????о??? ??1??? ?????? ????????????
????п???????????? ????? ????γ???????λ? ???м????????????д?????λ?????м???????
??????е?????? ?????????Щ??ι?????
?????? ????????е?????????????????????к??????????????
?????????????????
??????2?????????? ?????淨(jìng)????
??????????2??????