动词短语
中文翻译：Unknown
同义词：
['add on', 'increase', 'stack up', 'pile up']
例句：
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1.The extra work will only pile on your stress.
额外的工作只会增加你的压力。
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2.They are trying to pile up the evidence for their case.
他们正试图积累证据以支持他们的案件。
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3. The snow is piling up outside, making it difficult to get to school.
雪正在堆积，使得去学校变得困难。