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。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研何学。

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

那本书是十苦心钻研的成果。

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

这位教授的学问来自长的钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟个小时的时间钻研烹调书。

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 book was the result of ten years’ assiduous research.

本书是十年苦心钻研的成果。

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

这位教授的学问来自长年累月的钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了几个小时的时间钻研烹调书。

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。

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

那本书是十年苦心钻研成果。

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

这位教授来自长年累月钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了几个小钻研烹调书。

The professor is hammering at an economic problem.

教授正在钻研一个经济题。

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。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何学。

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

那本书是十年苦心钻研成果。

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

这位教授学长年累月钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了几个间钻研烹调书。

The professor is hammering at an economic problem.

教授正在钻研一个经济学题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻几何学。

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

那本书是十年苦心钻的成果。

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

这位教授的学问来自长年累月的钻。

Marjorie and Heather spent hours poring over cookery books.

希瑟花了几个小时的时间钻烹调书。

The professor is hammering at an economic problem.

教授正在钻一个经济学问题。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研。

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

那本书是十年苦心钻研的成果。

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

这位教授的问来自长年累月的钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了个小时的时间钻研烹调书。

The professor is hammering at an economic problem.

教授正在钻研一个经济问。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何学。

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

那本书是十年苦心钻研的成果。

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

这位教授的学问来长年累月的钻研。

Marjorie and Heather spent hours poring over cookery books.

马里和希瑟花了几个小时的时间钻研烹调书。

The professor is hammering at an economic problem.

教授正在钻研一个经济学问题。