YOU SAID:
I have lost my marbles
INTO JAPANESE
私は大理石を失っています。
BACK INTO ENGLISH
I am lost marble.
INTO JAPANESE
大理石をなくした
BACK INTO ENGLISH
Lost marble
INTO JAPANESE
白大理石
BACK INTO ENGLISH
Marble
INTO JAPANESE
白大理石
BACK INTO ENGLISH
Marble
That didn't even make that much sense in English.