ground hob

例句：

1. 1.The construction of the new bridge required extensive ground work.
   建造这座新桥需要大量的地基工作。
2. 2. The foundation of the house is made of solid stone.
   这所房子的地基是用坚固的石头做的。
3. 3. The engineer carefully examined the ground hob before starting the project.
   工程师在开始这个项目之前仔细检查了地基。