品种退化: degeneration of seed strainsdegeneration of varietydegradation of breeddegradation of varietydeterioration of strainsdeterioration of varietystandard aberrationvariety degeneration
The wvcs is designed after the collection and analysis of the wheat variety description issued by the authoritative department 收集和分析由权威部门发布的早地小麦品种说明，建立了黄土高原小麦品种选择专家系统。
