Into them farmers plant tough desert trees — like the faidherbia albida, a type of acacia — that fix nitrogen into the soil.
等这块泥土逐渐成为一块狭窄的小土地以后，就可以用来种植耐旱的沙漠植物——如金合欢树，它能在土壤中固氮。
Into them farmers plant tough desert trees — like the faidherbia albida, a type of acacia — that fix nitrogen into the soil.
等这块泥土逐渐成为一块狭窄的小土地以后，就可以用来种植耐旱的沙漠植物——如金合欢树，它能在土壤中固氮。
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