?? ??????????? ?????????????
![](https://image.chezhanri.com/2019/0308/20190308093521735.jpg)
????:1??????????:??????????
2????????
3???????
4???????q
5????????v
?????????????????6???????????21????????????????? (??)???21?????
????????????????????????????,????,???????????????????????,??????????????????????
???????,?5????,?????,???????????????,????????????,????,????????????????????????????????????????,?????????????????????????,???
????????,???,?????????????????“??????”??????????????????????????“?”??????,???????????????,???????,???????
?????,????“??????????????”???????????,????“???”????“?”????,??“????”,?????????????????????????????“?????????????????????????”,??????
????,?????????????“???”??????“?????????????????????????????????”,???“??????????????”???????????,????????????;????,?????????????????????????;??????,???????;????,????(????) ????????????????????:????