名词
中文翻译：堆叠
同义词：
['stack', 'pile', 'heap']
例句：
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1. The boxes are stacked neatly on the shelves.
箱子整齐地堆放在货架上。
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2. The mountain was covered in snow, making it difficult to see the top of the stacks.
山被雪覆盖，使得山顶难以辨认。
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3. The workers were stacking crates in the warehouse.
工人们正在仓库里堆叠纸箱。