短語詞組短語Safety of Navigation Circumstance 通航環(huán)境安全safety of navigation 航行安全safety in navigation 通航安全Subcommittee on Safety of Navigation 航行安全分委員會Ship Safety Navigation Certificate 船舶安全航行証書safety depth of navigation 安全航行水深safety of ship navigation 艦船航行安全ensuring safety navigation 航行安全保障sub -committee on safety navigation 航行安全小組委員會 返回 safety navigation