名词
中文翻译：土丘
同义词：
['heap', 'mound', 'hillock', 'mound of earth']
例句：
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1. The farmer has built a mound of dirt to mark the boundary of his land.
农民已经堆起了一堆土来标记他的土地边界。
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2. The children were playing in the mound of sand by the river.
孩子们在河旁的沙堆里玩耍。
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3. The old man was digging a mound of soil for his garden.
老人正在挖一堆土壤准备他的花园。