basic of soil classification category的用法和样例：
- higher category of soil classification category
- The successful design of Soil Classification Expert System(SCES) depends on the soil taxonomy that classifies soil types using quantitative data.
- The structures of soil classification decision trees and reasoning machine were also discussed to construct the framework of SCES.
- Since 1980s, the Soil Taxonomy based on by diagnostic horizons and characteristics of soils was introduced into Chinese soil classification.
- There are some clods of soil on the mat.