# retrogress ##### 词义 - #词性/v 倒退；退步；退化；后退；向后走 ##### 例句 - The stability of the high-yielding mutant was tested , the result showed that after passing 3 generations , the strain began to retrogress and the total titer had a substantial decline . - 同时通过对高产菌株进行传代培养检验其传代稳定性，结果表明，传代3代后，菌株开始退化，并且其发酵效价有比较显著的下降。 - The six chapter analyses the changes of the political and economical living conditions of the clan in Song dynasty , the imperial policy limit and the retrogress of the Lv 's family made it 's power not last as long as the old noble family . - 第六章分析其家族生存的社会政治经济条件的变化，君主的限制及吕氏自身的退化，使得吕氏势力无法像旧日的门阀士族长久不衰。 - Irrigation can improve the productivity and slacken the process of retrogress . - 灌水能提高苜蓿产草量，并减缓衰退过程。