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Từ điển WordNet v3.1 - WordNet Dictionary
natural depression
a sunken or depressed geological formation • Syn: depression • Ant: natural elevation • Hypernyms: geological formation, formation • Hyponyms: basin, bed, bottom, crater, hole, hollow, lowland, sinkhole, sink, swallow hole, trench, deep, oceanic abyss, trough, valley, vale
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