Qinhuangdao city is a important harbour city of the economic zone round Bobal sea in China.

秦皇岛市是我国环渤海经济区的重要港口城市。

The study result can provide scientific basis for laying down management regulation on prawn drift net fishing gear in the Bobal Sea.

这项研究成果为制定渤海对虾流网渔业管理细则提供了科学依据。

Basin development in Bobal Bay comprises two periods, i. e. rifting and depression, during which very thick Tertiary sequences deposited.

渤海湾盆地经历了断陷和拗陷两个发育阶段，其间接受了巨厚的第三纪沉积。