YOU SAID:

Deep is the sea, as my heart is black.

INTO JAPANESE

私の心は黒の海は深いです。

BACK INTO ENGLISH

Black Sea is deep in my heart.

INTO JAPANESE

黒海は心の奥底にあります。

BACK INTO ENGLISH

Black Sea is deep.

INTO JAPANESE

黒海は深いです。

BACK INTO ENGLISH

Black Sea is deeper.

INTO JAPANESE

黒海は深いです。

BACK INTO ENGLISH

Black Sea is deeper.