历史小径·世界史英语30篇（6）
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Mongol Horses Carried Messages Fast
蒙古快马传递文书
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The Mongol Empire built a vast relay system called Yam.
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Riders on fresh horses sped across thousands of miles.
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Each station had spare mounts and food for messengers.
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This network linked China, Persia, and Eastern Europe.
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Kublai Khan used it to govern his huge empire.
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Fast communication helped trade and military control grow.
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Travelers like Marco Polo used these safe roads too.
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Yam showed how transport shaped imperial power.