carburization zone

• 碳化层

carburization zone的用法和样例：

例句

1. Compared with it, the Hap-Udic Luvisols generated in the lower zone has less organic matter, but the structure of the organic matter is more complex.
   与之相比，低海拔地区发育的简育湿润淋溶土有机质含量下降，但结构复杂，土壤具有粘化层。