????:1?????app:??????

2????????

3???????

4???????

5???????

???????+???????????????2???17?????,?????????,?????20??“??????????????????????”???????????????

?????,?50%?????,60%?,70%?????????,80%?,90%??????????????,??,?????????,?????????,??

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

??????? ???

??????? ???????

? ???

?????????????????? ???

?? ?????????????

??? ?????

???? ? ???? ? ? ?

???? ??????????????

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