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

那本是十年苦心钻研。

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。

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。

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。

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

这位教授问来自月钻研。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了个小时时间钻研烹调书。

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

本书是十年苦心钻研成果。

The professor is hammering at an economic problem.

教授正在钻研一个经济学问题。

The boy puzzled his way through geometry.

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.

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.

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。

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。

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

这位教授问来自月钻研。

Marjorie and Heather spent hours poring over cookery books.

马乔里和希瑟花了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.

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.

那本书是十年苦心成果。

The professor is hammering at an economic problem.

教一个经济学问题。

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烹调书。