Mysteries of the Sea

摘要

<正> The sea is the largest unknown part of our world.It coversseventy-one per cent of the earth.There is still much to be discoveredabout this vast blanket of water.Luckily,no single nation has the task of learning all we need toknow about the ocean.The world sea is owned by no one;it surroundsthe earth and belongs to us all.Scientists in many different countries