field descriptor

例句：

1. 1. The field descriptor is used to describe the characteristics of a particular region.
   田野描述符用于描述特定地区的特征。
2. 2.The field descriptor helps farmers to identify the best crops for their fields.
   田野描述符帮助农民识别最适合他们田地的作物。
3. 3.The field descriptor can be used to measure the fertility of the soil in a specific area.
   田野描述符可以用来测量特定区域的土壤肥力。