有些土壤的碱性,实际上对某些植物的生长是过高的。
Some soils are actually too alkaline for certain plant life.
科学家研究土壤的构成。
随着土壤的流失,它会下降,形成一个尘土山,一个土丘。
As the soil is shed, it drops down and forms a little hill of dirt, a mound.
In Mesopotamia they usually didn't need to because the richness of the soil and so on.
在美索不达米亚,由于土壤肥沃及其他因素,通常是不需要施肥的
A lot of it can't produce the crop you would most like to grow.
大多数土壤并不能栽种出你最想要的作物
Every piece of that soil is necessary.
每一片特定土地的土壤都是必要的
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