?? ???????????????????
????:1?????app????:??????
2??????
3?????300?????
4???????600?????
5????????????
????? ???????
?1??????3??????? (????? ? ??)??????????????????,??,??,?????????????????????,?????????????????,?,??????????
????? ?????????????,??????,????????,???????????,??“???”“??????”,??
?????????????????????????????? ????????????,???,????????????????????,??“??”?(???)
???:??????????