苦心钻研

serious study and investigation

努力钻研技术

endeavour to perfect one’s skill

钻研业务已蔚然成风。

To improve one’s professional skill has now become a common practice.

他刻苦钻研的精神，值得效法。

His spirit of assiduous study is worthy of emulation.

年轻教师更应该努力钻研业务

молодой учитель обязан глубоко и старательно осваивать свою профессию

生产的发展促使我们不断地钻研技术。

The development of production impels us continuously to study technique.

这位作家渊博的学问来自长年累月的钻研。

The profound erudition of the writer came from long years of study.