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Sand Dunes Shift with Wind and Time
沙丘随风与时间移动
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Sand dunes form where wind moves dry sand across flat land.沙丘在风将干燥沙粒吹过平坦地带时形成。
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Their shapes change daily as strong winds blow from different directions.强风从不同方向吹来，沙丘形状每日都在变化。
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Some dunes grow taller near mountain ranges that block moist air.有些沙丘在阻挡湿润气流的山脉附近长得更高。
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Plants like grasses help hold dune sand in place near coasts.草类等植物有助于固定海岸附近的沙丘沙粒。
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Desert dunes can cover ancient riverbeds buried under layers of sand.沙漠沙丘可能覆盖埋在层层沙子下的古老河床。
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Human roads sometimes cross dune fields, needing regular maintenance.人类修建的道路有时会穿过沙丘地带，需要定期维护。
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Dune patterns reveal wind history across large arid regions.沙丘形态揭示了广大干旱地区的风向历史。
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Scientists map dune movement to understand climate shifts over decades.科学家通过测绘沙丘移动来理解数十年来的气候变化。