品种退化: degeneration of seed strainsdegeneration of varietydegradation of breeddegradation of varietydeterioration of strainsdeterioration of varietystandard aberrationvariety degeneration
适: 形容词1.(适合) fit; suitable; proper 短语和例子适于儿童阅读的书籍 books suitable for children; 她适于做这工作吗? is she suitable for the job? 这种船只适于在风平浪静的海上航行。 such a boat is fit only for a calm sea.2.(恰好) right; op