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 sea
the Bohai Sea
offshore Bohai
Bohai sea area
Bohai Sea waters
Bohai offshore area
offshore part of the Bohai Bay Basin
bohai bay
regularity of gas-generation
dual certificate system