jīng guò / duō nián / de / mó liàn / tā / zhōng yú / bǎi liàn chéng gāng / chéng wéi / yì míng / yōu xiù / de / gōng chéng shī

经过多年的磨炼，他终于百炼成钢，成为一名优秀的工程师。

After years of hard training, he was finally tempered into steel and became an excellent engineer.