????:1???????????:?????VX

2?????????

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

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

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

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

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