Definition (陈述)
According to what someone has said about themselves, something is true, although it has not been proven.
据某人自述（但未证实）
By his own account, he was a brilliant athlete in his youth.
根据他自己的说法，他年轻时是一位出色的运动员。
She said that, by her own account, she had never been happier.
她说，据她自己所言，她从未如此快乐过。
By his own account, he was completely unaware of the incident.
根据他自己的说法，他对这起事件完全不知情。