?? ??“??????????????????”
????:1?????????:???????
2???????
3???????
4?????
5?????????
9?????????????19??,?“??”(Sigma Geography)??????????????,“???”????????????,????????????“??”,??????????????
“??????????????”???????????????????????,???“??”??????????????????????????????????????????????,??“???????”??????????????????????????,??????,??,????????????,????????????
“?”???????????????????????????“?????????????????”?????????????????????,????????????(?? ?????????)
??:????