YOU SAID:

the 9/11 terrorist attacks were the worst attacks in history

INTO JAPANESE

9/11テロ攻撃は史上最悪の攻撃だった

BACK INTO ENGLISH

The 9/11 terrorist attack was the worst attack in history

INTO JAPANESE

9/11テロ攻撃は史上最悪の攻撃だった

BACK INTO ENGLISH

The 9/11 terrorist attack was the worst attack in history