1.
You are a difficult case.
你是个老大难问题。
2.
We have solved a number of most difficult problems.
我们已经解决过一些老大难问题。
3.
Drought and soil erosion had long been a major problem.
干旱和水土流失一直是个老大难问题。
4.
'It might be a long time,' said O'Brien.'You are a difficult case.
“可能要过很久，”奥勃良说，“你是个老大难问题。
5.
Finding the solution to this perennial problem .is no easy task．
为这个老大难问题找到解决办法可不是件容易的事。
6.
Questions of intellectual influence and causation are notoriously difficult, especially in the case of an author so far removed in time.
问题的智力影响和因果关系，是个老大难问题，特别是在案件作家如此远的时候。
7.
The main focus of this article is rent rates, a very difficult problem within the historical research of land system.
本篇主要目的是要探讨土地制度史研究中“地租率”这一个老大难问题。
8.
In many places there is a problem over intellectual property because of an imbalance of power between copyright and patent holders on the one hand, and the public on the other.
在很多地方，知识产权都是个老大难问题，原因就是版权和专利权所有人和公众之间权限的失衡。
9.
That question may be difficult to answer.
这个问题大概很难回答。
10.
The teacher answered our difficult questions.
老师解答我们的疑难问题。
11.
Drill problems are included courtesy of the teaching assistants listed below.
疑难问题及提供的老师名列表如下。
12.
The class remained mute when the teacher asked a difficult question.
老师问到难题时, 全班都沉默无言。
13.
World Assembly on the Elderly
老年人问题世界大会
14.
international conference on elderly refugees in Europe -- "Age in Exile"
欧洲老年难民问题国际会议－“流亡中的老年人”
15.
This problem is hard enough to perplex even the teacher.
这个问题确实很难,以至于老师都迷惑不解。
16.
Problems in Funds-Collecting of Basic Endowment Insurance and the Corresponding Countermeasures;
基本养老保险费征缴难问题的对策研究
17.
Difficulty and Countermeasures of Employment Problem of Old Industrial Base;
解决老工业基地就业问题的难点与对策
18.
Three Questions on the Issue of College Graduates Employment Need to Be Made Clear;
大学生就业难问题中需要厘清的三个观念问题