surface compaction

例句：

1. 1.The soil is being compacted by the heavy machinery.
   土壤正被重型机械压实。
2. 2. The surface of the lake is being compacted by the wind.
   湖面正被风压实。
3. 3. The engineer used a machine to compact the soil for construction.
   工程师使用机器将土壤压实以便施工。