钻研

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

那本书是十年苦心钻研的果。

The professor is hammering at an economic problem.

教授正在钻研一个经济学问题。

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

这位教授的学问来自长年累月的钻研。

The boy puzzled his way through geometry.

那孩煞费苦心地钻研几何学。

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烹调书。