钻研

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

那本书是十苦心钻成果。

The professor is hammering at an economic problem.

教授正在钻一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻学。

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

这位教授学问来自长钻。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了个小时时间钻烹调书。