The boy puzzled his way through geometry.

那男孩煞费苦心地研几何学。

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

那本书是十年苦心研成果。

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

这位教授学问来自长年累研。

Marjorie and Heather spent hours poring over cookery books.

马里和了几个小时时间研烹调书。

The professor is hammering at an economic problem.

教授正在研一个经济学问题。