????:1???????:????90????????

2???????????

3???????????

4??????????

5????????????

???????????????10??8???? ????????????????????8??????????,???????,??58%,???,??????????????????????????

?????????????,???????????????«Wetlands»?????????????????????????????,???1?3?:1920?????1950?????????????????????,??????;????????????1950?????????????????,?????;?2010??,?????????????58%????????????

??????????,?????????????,??????????????????,????????;?????,?????????????,???????????,?????????????

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

?????????,????????????????,?1984???2016?????????????16%?20?????????????,???,????????????,?????????????

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