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Rivers Are Nature's Highways
河流是自然的高速公路
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Rivers flow from high land to low land.河流从高地流向低地。
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They carry water, soil, and small rocks.它们携带水、泥土和小石块。
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Many cities grow near big rivers.许多城市在大河附近发展起来。
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Fish live in clean river water.鱼类生活在洁净的河水里。
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People use rivers for boats and farms.人们利用河流行船和灌溉农田。
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Dams can stop river water for power.水坝可拦蓄河水用于发电。
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Pollution makes rivers dirty and dangerous.污染使河流变得肮脏且危险。
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We must keep rivers clean and safe.我们必须保持河流清洁与安全。