阿拉伯海北部公海海域
open seas of northern Arabian Sea
冰冻海域气候
frost climate of sea area
渤海海域
Bohai offshore
bohai bay
bohai sea
regularity of gas-generation
the Bohai Sea
offshore Bohai
Bohai sea area
Bohai offshore area
dual certificate system
offshore part of the Bohai Bay Basin
Bohai Sea waters