洋底

yángdǐ
  1. ocean floor
  2. bottom of the ocean

CEDICT

Entry Composition

1 洋 yáng
  1. ocean
  2. vast
  3. foreign
  4. silver dollar or coin
2 底 dǐ
  1. bottom; base
  2. background; foundation
  3. copy (of a manuscript or receipt etc) kept as a record
  4. (suffix) end of a year or month
  5. (math.) radix; base (abbr. for 底數 dǐshù)