钻研

The book was the result of ten years’ assiduous research.

那本是十苦心钻研的成果。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时的时间钻研。

The professor is hammering at an economic problem.

教授正在钻研一个经济问题。

The professor's erudition came from long years of study.

这位教授的问来累月的钻研。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何。