地理漫步·世界地理英语30篇（7）
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Estuaries Mix Salt and Fresh Water Naturally
河口：咸淡水自然交汇之地
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Estuaries form where rivers meet the sea and waters mix.河口是河流入海、咸淡水交汇之处。
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Tides push salt water upstream while rivers bring fresh water down.潮汐将海水推向河流上游，而河流则将淡水带向下游。
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This mixing creates nutrient-rich water full of tiny sea life.这种混合形成了富含养分、浮游生物丰富的水体。
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Mudflats and salt marshes in estuaries feed many shorebirds.河口的泥滩和盐沼为众多滨鸟提供食物。
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Pollution flows easily into estuaries from upstream farms and cities.上游农场和城市的污染物极易流入河口。
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Oyster reefs and seagrass beds help clean estuary water naturally.牡蛎礁和海草床能自然净化河口水体。
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Fish like salmon and shrimp use estuaries as nurseries.鲑鱼和虾等鱼类将河口用作育苗场。
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Human ports often sit at estuaries because of deep, sheltered water.人类港口常建在河口，因其水深且受庇护。