?? ??????????????????
????:1?????????????:???
2???????
3?????????
4?????????app
5?????????
???????????1????????20?????? (? ?????)?20????,?????????,???????
?????«??????????????(???)??»,?????????????????(??????????)??3????,????6000??????????????????????????????????,?15%???,?1??,???500???
20????,?????????????????????“????????????,????3999??,????????500???????????????????,???480?,???980????,??????‘????’?”??
???????,??,???,????????????“??”????,?????????????????????????????????????????????????“?”?(?????????) ????????????:?????