钻研

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

那本书是十年苦心成果。

The professor is hammering at an economic problem.

教授正在一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦心几何学。

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

这位教授学问来自长年累。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时时间烹调书。