名词短语
中文翻译：压实层
同义词：
['compaction', 'compaction', 'layer compaction']
例句：
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1. The soilwas compacted before the construction began.
施工开始前，土壤被压实了。
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2.The engineer used a compaction machine to improve the ground's strength.
工程师使用压实机来增强地面的强度。
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3. The compaction process is crucial for ensuring the stability of the foundation.
压实过程对于确保地基的稳定性至关重要。