“海底的”的英语？

港口的外?ё?落在直插海底的混凝土基椿上.The outer wall of the harbor would be stand on concrete stilts.同样原因, 确定人在海底的位置比确定人在空中的位置要更加困难.For a similar reason, knowing where you are undersea is much more difficult than in space.在海底的浮游生物必须被保护起来...