???6?4??????????? 6??4????,?????????????????,??

?????,?????????????,????????????????????????????????,????????????????,????????????????,?????????,??,??

????????:????????? ??“??????????”????

?? ???????????????????

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

2???????

3?????????

4?????v

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

???6?4??????????? 6??4????,?????????????????,??

?????,?????????????,????????????????????????????????,????????????????,????????????????,?????????,??,??

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