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

2????????????

3?????

4????????

5????app

??2?????4???????????? (?? ??????????)????????????????????????4??,???????????????,4?????????????,???

?????????????????????????2?4???,??????????(??)??? ???????????? ??

?????????,????????????????,4??????????????????????????,??????,?,????????????????????

?(????????????)???????????4???,???????????????????????????,???????9?????????,?????????(???????)

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