YOU SAID:

this is the best thing in the WORLD!

INTO JAPANESE

これは世界で最高のものです！

BACK INTO ENGLISH

This is the best thing in the world!

INTO JAPANESE

これは世界一のことです。

BACK INTO ENGLISH

This is the world's top thing.

INTO JAPANESE

これは世界一のことです。

BACK INTO ENGLISH

This is the world's top thing.