????:1????????????:?????95??98

2???????

3?????????

4??????????

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

?2?????21?????????????????????? (????????? ????????????????????)21??????????,???8???

???????,??,???????????,?????????????????????????????????4???????????4???????????????,?????????????????????????????,????????????“???”???????,???????????????????,??????????????

??????,?????,??????,??????“??”???“1+N”?????,??????????????????????,???????,???????????????,???,?????????????????,??????????,??,??????????????????(???????????????)

???????????:??????