动词
中文翻译：堆积
同义词：
['heap', 'stack', 'accumulate']
例句：
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1. The children were playing with their toys in the piles of sand.
孩子们在沙堆里玩耍。
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2. The books were piled high on the shelves.
书被堆得高高的放在书架上。
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3. The workers had to pile up the wood for firewood.
工人们不得不把木头堆起来作为柴火。