历史小径·世界史英语30篇（6）
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Rivers Helped Cities Grow
河流助力城市兴起
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Ancient cities grew near big rivers.
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The Nile, Tigris, Euphrates, and Indus were key.
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Rivers gave water for drinking and crops.
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Farmers planted wheat and barley by the banks.
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Boats carried goods and messages upstream.
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People built temples and homes near water.
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River floods brought rich soil each year.
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These cities became centers of learning and trade.