marine regression

• 海退

marine regression的用法和样例：

例句

1. This was the result from the large-scale regression in the Late Ordovician.
   这是奥陶纪晚期大规模海退的结果。
2. The concepts of marine transgression and regression are considered to be fundamental.
   海进和海退概念被认为是基本的概念。