????????????????????????1???????20?????,???????????,??????47????????????????????????,???????????,????????

???“??????”?????????????,????????(John Ross)??,????????????????,???????????,??,??????????“????”??,???,???(? ??? ???)

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

“??????”????

?? ????????????????:?????????????,???????

????:1???????:??51??????

2?????????

3?????app

4??????????

5????????

????????????????????????1???????20?????,???????????,??????47????????????????????????,???????????,????????

???“??????”?????????????,????????(John Ross)??,????????????????,???????????,??,??????????“????”??,???,???(? ??? ???)

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