1. 衰退：retrograde ejaculation 倒行射精 | retrogression 衰退 | retrogressive evolution 后退演化
2. 后退：retrograde wave 後退波 | retrogression 後退 | retroreflection 回反射
1. 倒退;衰退;退化
Retrogression means moving back to an earlier and less efficient stage of development.
e.g. There has been a retrogression in the field of human rights since 1975.
自1975年来，人权状况出现了倒退。
1. It's a form of retrogression, not a sign of Internet enlightenment.
2. It warns that we might find in 30 years that human civilization is on the brink of retrogression.
3. For these reasons blogging represents retrogression in the standards of public discourse.
4. " Such a scheme of historical retrogression is bound to fail, " concluded the white paper.
5. This is a struggle between progress and retrogression, and between unity and separation.
noun
1. returning to a former state
Synonym: regression regress reversion retroversion
2. danci.911cha.com
2. passing from a more complex to a simpler biological form
Synonym: degeneration