本文阐述了溯源淤积和侵蚀基准面的概念。
The academic circle all agree that Zhuangzi's social perspectives were retrogressive, and should be criticized.学界一致认为庄子的社会观是倒退的，应受到批判。
The eclogite remains well its original characteristics, which has only suffered slight retrogressive metamorphism.榴辉岩原始特征保存完好，仅遭受轻微的退变质作用和叠加变质作用。
