YOU SAID:
Your mom is fatter than a truck
INTO JAPANESE
あなたのお母さんはトラックよりも太っています。
BACK INTO ENGLISH
Your mother is fatter than the truck.
INTO JAPANESE
あなたのお母さんは、トラックより太っています。
BACK INTO ENGLISH
Your mother is fatter than the truck.
That didn't even make that much sense in English.