愚公移山

他以愚公移山的精神坚持研究，最终攻克了这个难题。

Tā yǐ Yúgōng Yíshān de jīngshén jiānchí yánjiū, zuìzhōng gōngkè le zhège nántí.

With the spirit of the Foolish Old Man who moved the mountains, he persisted in his research and finally conquered this difficult problem.