??????one. ???? ???? ?? ?????????? ??? ???? ??? ??? ?? ?? ? ????. ??? ???? ?? ??? ??? ?????:1??? (??): ? fifty,000? ~ 70,000?three??? (??): ? 130,000? ~ 180,000?six??? (?? ???): ? 250,000? ~ 300,000???? ?? ? ???? ?? ??? ??? ??? ? ??, ?? ??? ???? ??? ?????.2. ????? ??? ? ?? ?????? ??? ??? ?? ??? ? ????. ??? ???? ???? ?????:one) ?? ??????: ?? ??, ??