品种退化: degeneration of seed strainsdegeneration of varietydegradation of breeddegradation of varietydeterioration of strainsdeterioration of varietystandard aberrationvariety degeneration
排列: 1.(顺次序放) arrange; rank; place; range; put in order; arrangement; permutation 短语和例子排列成行 arrange in a row [line; column]; 按字母顺序排列 arrange in alphabetical order; 依大小次序排列 arrange in order of s