泥沙
word C2- silt
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然而，到了19世纪中叶，黄河改道和泥沙淤积使部分河段难以通航；
偏偏这里的雨水又集中在夏天，常常是一场暴雨下来，大量泥沙就顺着沟壑流进了黄河。
久而久之，高原被雨水切割得千沟万壑，黄河里的泥沙也越来越多。
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