?????????11????????????17????19??????,????,?????

???????,?????????????????????????????“??”????????????????????(G20)?“??”,???????????????????“G20??”???,??????????????,??G20??????????,???

???????????:???? ??“???????”????

?? ??????:??????????????G20??

????:1????????:????vx

2????????

3?????????

4????????????

5?????

?????????11????????????17????19??????,????,?????

???????,?????????????????????????????“??”????????????????????(G20)?“??”,???????????????????“G20??”???,??????????????,??G20??????????,???

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