名词
中文翻译：堆积物
同义词：
['heap', 'stack', 'mound']
例句：
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1.The pile of books is too heavy to carry.
那堆书太重了，搬不动。
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2.The farmer piled up the straw for firewood.
农民把稻草堆起来当柴火。
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3.The children are playing with the toys that have been piled on the floor.
孩子们正在玩那些被堆在地上的玩具。