YOU SAID:

Once in a blue moon my cow eats his own stomach

INTO JAPANESE

私の牛は青い月に一度、自分の胃を食べる

BACK INTO ENGLISH

My cow eats its stomach once a blue month

INTO JAPANESE

私の牛は月に一度そのお腹を青く食べる

BACK INTO ENGLISH

My cow eats its stomach blue once a month

INTO JAPANESE

私の牛は月に一度、そのお腹を青く食べる

BACK INTO ENGLISH

My cow eats its stomach blue once a month