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1·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。

2·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。

3·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。

4·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。

5·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。

6·Natural soil thermoluminescence survey whose repeatability is very good can be used in exploring deep deposit.

土壤天然热释光法是一种能达到攻深找盲的方法，而且它的异常重复性很好。

7·Natural soil was prone to be disturbed. The structural strength consequently was reduced and the engineering properties changed.

天然结构性土体在工程实践中易受扰动，导致结构强度降低，工程性质改变。

8·For some routes, traffic volume may be so low that no surfacing is economically justified and natural soil serves as the roadway.

对于一些线路，交通量可能会很低以至于不用路面在经济上都是合理的，天然的土壤就可以直接为道路服务。

9·The study shows that natural soil types have such a high infiltration capacity, that no significant sealing effects are obtained.

研究表明，天然土渗水性是如此之高，以致于起不到明显的隔水效果。

10·One focus of the design was the urban park in the city center. It was built on natural soil, so the trees and bushes could grow nicely.

设计重点之一是市中心的城市公园，它建于自然土壤之上，树木和灌木可以蓬勃生长。