????:1?????app???:??????

2????app??????

3???????????

4????????

5??????

????2?21????? (???? ???????? ?????????????)2?????????????21???????,??????????,?????????????????????????????????????????????????????????……?,???????????????

???(??“???????”)?“?????”,?????????

??????????????????????????,???????????????,10????????????????,4????

?,??“??”?????????????????????????????????????????????,??????

???????????????2???????21??,???? ??

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

“???,???4???,40???????5???,??????????5?????????????,?????????????????????????????,??????”??

????2???????????????????21???????,??,??????????????????????? ??????

??,????,??????,?????????,??,????????????????10???????,??“?”?

?????????,?????4??,?,????(?????????????)

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