钻研

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

是十年苦心钻研成果。

The professor is hammering at an economic problem.

教授正在钻研一个经济学问题。

The boy puzzled his way through geometry.

男孩煞费苦心地钻研几何学。

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

这位教授学问来自长年累月钻研。

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。