片语
Ship Safety Navigation Certificate船舶安全航行证书
sub-committee on safety navigation航行安全小组委员会
safety of navigation航行安全
ensuring safety navigation航行安全保障
safety of ship navigation舰船航行安全
Subcommittee on Safety of Navigation航行安全分委员会
safety depth of navigation安全航行水深
Safety of Navigation Circumstance通航环境安全
safety in navigation通航安全