miàn / duì / fù / zá / de / yán / jiū / xiàng / mù / ， / tā / shǐ / zhōng / xiāng / xìn / dī / shuǐ / shí / chuān / ， / jiān / chí / le / zhěng / zhěng / sān / nián / 。

面对复杂的研究项目，他始终相信滴水石穿，坚持了整整三年。

Faced with a complex research project, he believed in the power of persistence and kept at it for three full years.