?? ?????????:??“?50???”
????:1???1000?????:?????
2??????????
3???????
4?????????????
5????????app
?????11??20?????,???????
??,????,?,??,??????????????????????????????????????“????????????????????????????”?????,???????????????????????????,????????“??50???”,???,????????????????????????????????????
?????
????? ??? ???????????
?? ????? ????????????????? ?????? ??????????????????? ???????????????
?? ?????????????:????