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

2????????

3???app??

4?????sn????

5?????app

6?20??,?????????????,???????????????20?,6?????????????????9??18???,????????????? ??? 6?????????20???,?,????20?????????????,6?????????9?18??,??????????????????????????????????? ??? 6?20?,?,???????20?,6?9?18?????????????,??????????????????????????? ?????? ??????????:????