They differ in their fat and nutrient content.

它们的脂肪和营养成分不同。

They grow in regions where nutrient content in the soil is poor, and so they have a little way of supplementing their diets.

它们生长在土壤养分含量低的地区，并且有个丰富饮食结构的方法。

On average, protein levels fell by 10 percent iron by 8 percent and zinc by 5 percent, But a lower concentration of nutrients doesn't necessarily correlate with a decline in the plant's nutrient contents.

平均而言，蛋白质含量下降 10%， 铁含量下降 8%， 锌含量下降 5%，但较低的养分浓度并不一定与植物养分含量的下降相关。