河流为什么都是弯曲的？有没有笔直的？动画演示牛轭湖形成原因
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百转千回、九曲连环、七弯八拐、蜿蜒曲折.....提起来形容河流的成语，十个有九个都是说它“弯”的。可你有没有想过，河流为什么总是弯的？是诞生之初就是弯的，还是后来一点点变弯的呢？
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