natural foundation

• 天然地基

natural foundation的用法和样例：

例句

1. The landfill sits on a natural foundation of London clay which is more or less impermeable.
   垃圾填埋场位于不易渗漏的伦敦黏土天然地基上。
2. It is often the case in Foundation Engineering that foundation subsoils are consisted of more than one layer.
   天然地基和人工地基通常是由多个土层构成。