Qingdong sag is a secondary structure unit of Jiyang depression and lies in Bohai shallow sea waters.

青东凹陷是济阳坳陷的一个次级构造单元，位于渤海浅水海域。

youdao

Qingdong sag is a secondary structure unit of Jiyang depression and lies in Bohai shallow sea waters.

青东凹陷是济阳坳陷的一个次级构造单元，位于渤海浅水海域。

youdao