这意味着表层土壤几只含有少量长期成功耕作所必需的成分。

This means topsoil contains few of the ingredients needed for long-term successful farming.

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在长期从事耕作的地区（底海拔地区），人们用火把农作物残渣烧掉，清理出土地为下一个生长季节做好准备。

In permanently cultivated (usually lowland) areas, fires are used to burn crop residues and get the land ready for the upcoming growing season.

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以致在50岁时，在河南故乡土地上长期的辛劳耕作让他的手臂留下了绳索的烙印。

Even at age 50, the rope of muscles on his arms bespoke a lifetime of hard plowing and harvesting in the fields of his native Henan Province.

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