ocean

beach; CL:片[pian4]

navy

(name) Helen or Hélène; see 海倫市|海伦市[Hai3 lun2 Shi4]

pirate

sea; ocean

Shanghai municipality (short name 滬|沪[Hu4])

the mind; the brain

to go out to sea; (neologism) to expand into overseas markets

deep sea