钻研

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

那本书是十年苦心钻研成果。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时时间钻研烹调书。

The professor is hammering at an economic problem.

教钻研一个经济题。

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

这位教来自长年累月钻研。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何。