海底

seabed;sea floor; bottom of the sea
～地形sea floor relief /～采矿submarine mining; undersea mining; ocean mining/ ～电报submarine telegraph;cablegram/～电缆（线）submarine cable /～管理局seabed authority/～火山submarine volcano/～技术undersea technology/～架submarine shelf/～开发seabed exploration/～勘探submarine survey and exploration/～矿submarine mine/～爬行器bottom crawler/～区域seabed area/～山sea-mount /～生物benthos; benthon;bottom inhabitants/～实验室sealab/～水雷ground mine (or torpedo)/～延伸sea floor spreading/～养殖bottom culture /～油田offshore oilfield/～淤泥bottom silt/～资源seabed resources;submarine resources