Tā / nián / qīng / shí / céng / jīng / fàn / guò / xǔ / duō / cuò / wù / rú / jīn / yǐ / jīng / zuó / fēi / jīn / shì / chéng / wéi / tuán / duì / de / gǔ / gàn。

他年轻时曾经犯过许多错误，如今已经昨非今是，成为团队的骨干。

He made many mistakes when he was young, but has since changed and become a key member of the team.