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

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

3?????????

4????????

5???????

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

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

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

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