地理漫步·世界地理英语30篇（8）
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Sand Dunes Shift with Wind and Water Flow
沙丘随风与水流而迁移
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Sand dunes move slowly as wind carries grains across deserts.沙丘在风力作用下缓慢移动，沙粒被吹过沙漠。
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Their shape depends on wind direction, sand type, and plant cover.沙丘的形状取决于风向、沙子类型和植被覆盖情况。
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The Sahara holds some of the world’s tallest moving dunes.撒哈拉沙漠拥有一些全球最高且仍在移动的沙丘。
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Coastal dunes protect beaches from strong waves and storms.海岸沙丘能抵御强浪和风暴，保护海滩。
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Plants like sea oats hold dune sand in place with deep roots.海燕麦等植物依靠深根固定沙丘沙土。
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Human paths and vehicles damage dunes and speed up erosion.人类踩踏和车辆碾压会破坏沙丘，加速侵蚀。
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Dunes form patterns seen from space—ripples, stars, and crescents.沙丘形成的图案（如波纹、星形和新月形）可从太空观测到。
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They show how small forces shape large landforms over time.它们展现了微小力量如何随时间塑造大型地貌。