1??21?,??? ??? ? 1???21?????,??????????????,??????????? ???????? ??????????????? 1???????????????21?,??? ??? ?????????????? 1?21?,???????????????????????? ? ? 1?????21?,?????,????? ??? ?????????????????? ??????:???? ??“???????”????

?? (????)?????????? ????

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

2?????????

3?????app

4??????200??500

5???????

1??21?,??? ??? ? 1???21?????,??????????????,??????????? ???????? ??????????????? 1???????????????21?,??? ??? ?????????????? 1?21?,???????????????????????? ? ? 1?????21?,?????,????? ??? ?????????????????? ??????:????