会唱歌的沙丘：哈萨克斯坦的自然之音
In the country of Kazakhstan, there is a special sand hill. It sits in Altyn-Emel National Park. People call it the Singing Dune. But it does not sing with a voice.
When the sand slides down the hill, it makes a sound. The sound is like a low hum or a deep song. You can hear it far away. It is louder when the sand moves fast.
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