动词短语
中文翻译：堆积
同义词：
['stack', 'pile up例句：1. The workers are busy piling up the sandbags for the flood defense.（工人们忙着堆沙袋防洪。）']
例句：
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1. The workers are busy piling up the sandbags for the flood defense.
工人们忙着堆沙袋防洪。
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2.The mountain range is piling up with snow as winter approaches.
随着冬季的临近，山脉上积满了雪。
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3.The children were piling up their toys on the floor when I came in.
我进来时，孩子们正把他们的玩具堆在地上。