pelagicadj.远洋的pelagic polychaete浮游多毛类(动)pelagic slope muds深海坡积软泥pelagic potychaete浮游多毛类pelagic animalcule海洋微生动物pelagic environment远洋环境pelagical resources中上层资源,远洋资源pelagic crustaceans浮游甲壳类pelagic diatom oozes深海硅藻软泥pelagic ocean community大洋群落pelagic abyssal sediment远洋深海沉积物