????:1??????300????:?????????

2?????app????

3?????????

4???????200??????

5?6????????

???????????????12?20?? (???????? ??????????????)????????20??????,?????????????????

12???????20???????,????????????? ?

????????,???500?????????????500??????????????????????????????????????????

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

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

??????????????,???????????????(???)???????????????,???,??????,“?,???,??”(?????????????????????)

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