????:1?????:???????

2??????

3??????????

4???????

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

9??19???,??“????????????”(Sigma Geography)????????????????????????,“????????????”?????????????????,???????????“??”,???

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

“?????????????”?????????????????“???????????”?????????????????????,????????????????????(??? ?)

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