?? ??????«??2»??????
![](http://n.sinaimg.cn/news/transform/w600h400/20180313/znsk-fyscsmu9435064.jpg)
????:1?????????:??????????
2??????
3????????
4???app????????
5????????
??2????????16??? ?«???????»(????????????«???????????2»)?,??????????,????????????????????????????????,??????????????«????????2»??:
????????????????,???????;
???,??,?????????;
?????????????????;
?????;
???????????????????????????;
?????????????????????,?;
???????????????,??????????????(??) ???????????:???