Natural soil fertility is dropping in many areas because of continuous industrial fertiliser and pesticide use, while the growth of algae is increasing in lakes because of the fertiliser run-off.

在很多地区，由于工业化肥和农药的持续使用，导致自然土壤的肥力正在下降，然而化肥的流入却导致湖泊中藻类生长得越来越快。

The Numbers in the natural soil were less than those in the sterilized soil.

并且都能够在自然土和灭菌土中定殖，自然土中的菌量低于在灭菌土中的菌量。

The foundation for an earth-fill dam would be the natural soil or rock on which the dam is placed.

“基础”一词可能是指土基本身或是置于其上提供支撑的物体，或者是二者的结合。

Composite foundation is a kind of artificial foundation setting up reinforcement body in natural soil.

复合地基是在自然地基土体中设置加固体的一种人工地基。

Use sod instead of grass seed and take advantage of natural soil erosion inhibitors like straw and compost.

而使用草皮草种，并利用秸秆等自然土壤侵蚀抑制剂和堆肥的优势。