The boy puzzled his way through geometry.

那男孩煞费地几何学。

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

那本书是十的成果。

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

这位教授的学问来自长累月的。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了几个小时的时间烹调书。

The professor is hammering at an economic problem.

教授正在个经济学问题。