地理漫步·世界地理英语30篇（5）
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Estuaries Mix Salt and Fresh Water Naturally
河口自然混合咸水与淡水
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Estuaries form where rivers meet the sea and waters blend.河口是河流入海、咸淡水交汇之处。
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Tides push saltwater upstream while rivers bring freshwater 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 unique brackish zones rich in nutrients.这种混合形成了富含养分的独特半咸水区。
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Mangroves, salt marshes, and oyster beds thrive here.红树林、盐沼和牡蛎床在此繁茂生长。
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Sediment settles in calm estuary waters, building new land gradually.泥沙在平静的河口水域沉积，逐渐形成新陆地。
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Fish and birds use estuaries as nurseries and feeding grounds.鱼类和鸟类将河口用作育苗场和觅食地。
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Pollution flows easily into estuaries, so they need careful protection.污染物易流入河口，因此需加以精心保护。
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Human ports and farms often occupy estuary edges worldwide.全球各地的河口边缘常被人类港口和农田占据。