chalk grassland 白垩草地： 在白垩母质的土壤上形成的草地，草地土壤中富含白垩质，土壤偏碱性，植物中多豆科牧草。
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The trust manages the cliffs as chalk grassland, parts of which are grazed by Exmoor ponies to preserve the natural flora and support wildlife.
BBC: The white cliffs
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