tā / yǐ / qián / bèi / rèn / wéi / shì / dǎi / cái / hòu / lái / kào / nǔ / lì / chéng / le / yōu / xiù / de / jì / shù / yuán

他以前被认为是歹材，后来靠努力成了优秀的技术员。

He used to be considered incapable, but through hard work he later became an excellent technician.