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

那本书是十年苦心钻研成果。

The professor is hammering at an economic problem.

教授正在钻研一问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研何。

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

这位教授问来自长年累月钻研。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了时时间钻研烹调书。

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

那本书是十年苦心成果。

The professor is hammering at an economic problem.

教授正在一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地几何学。

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

这位教授学问来自长年累月。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时时间烹调书。

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

那本书是十年苦心成果。

The professor is hammering at an economic problem.

教授一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地几何学。

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

这位教授学问来自长年累月。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时时烹调书。

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

那本书是十年苦心钻研成果。

The professor is hammering at an economic problem.

正在钻研一个经济题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何。

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

这位来自长年累月钻研。

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书。

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

那本书是十年苦成果。

The professor is hammering at an economic problem.

教授正在一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦地几何学。

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

这位教授学问来自长年累月。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了几个小时时间烹调书。

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

那本书是十苦心钻研成果。

The professor is hammering at an economic problem.

教授正在钻研一个经济问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几。

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

位教授问来累月钻研。

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书。

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

那本书是十年苦心钻研成果。

The professor is hammering at an economic problem.

教授正在钻研济学问题。

The boy puzzled his way through geometry.

那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间钻研烹调书。

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

书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书。

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

那本书是十年苦心钻研果。

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.

那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书。