For a long time, the pulp density detection has been a very thorny problem.

In most of the developed world, immigration is a thorny problem; it must be curbed and controlled.

时过境迁，在大多数发达国家，移民已成为一个棘手的问题：对它必须加以限制和控制。

The Civilized Thorny Problem Of Jiangsu Road? And Study On Advanced Ethical Theories

江苏道路的文明难题与伦理学前沿理论研究

L1 Negative transfer has been a thorny problem for Chinese students to improve their English writings.

长期以来，母语负迁移一直是中国学生提高英语写作水平的主要障碍之一。

Caution of Resource Curse and Solution of Thorny Problem of Development of Resources in Western China

资源诅咒的警示与西部资源开发难题的破解

Echo printing is one of the oldest ways to debug a thorny problem.

回显打印是调试困难问题的最古老的方法之一。

Their thorny problem is rising inflation, which hit 5.1 per cent last month.

他们面临的棘手问题是不断上升的通胀上月达到了5.1%。

For younger patients with the treatment of scoliosis has been a thorny problem.

对年龄较小的脊柱侧凸患者的治疗一直是一个棘手的难题。

In Japan, though, this is proving a particularly thorny problem.

然而在日本，事实证明这是一个尤其棘手的问题。

One of the main factors that may influence the comfort inside the passenger car is the noise, which is also a thorny problem.

旅客列车车内振动和噪声是影响乘坐舒适性的主要因素之一，也是较难解决的问题。

Race relations in the US continue to be a thorny problem. Racism remains a touchy issue.

美国的种族关系一直是棘手的问题。种族主义可是个要小心处理的问题。

Objective: The treatment and rehabilitation medicine of the damaged peripheral nerve has been a thorny problem for long.

目的：周围神经损伤后的治疗和康复，长期以来都是医学界一个棘手的难题。

The future of Taiwan and the smaller offshore islands remains a thorny problem, and only half submerged.

台湾以及一些近海岛屿的前途仍然是棘手的问题，若明若暗。

Along with the gradual approach of the digital age, it has become a thorny problem to break the traditional advertising operation mode.

伴随着数字时代的逐渐走近，突破传统广告的运营模式便已经成为一个棘手的问题。

When faced with a thorny problem, you especially have to cooperate with each other to seek a resolution.

遇到棘手问题的时候，更要彼此合作，寻求解决之道。

How to deal with the relationship between freedom of divorce and opposition to wanton divorce is a thorny problem.

如何处理离婚自由与轻率离婚之间的关系是个难题。

The effect of atmospheric refraction error on observed value is a very thorny problem in EDM trigonometric leveling.

在光电测距三角高程测量中，大气折光对观测量的影响是一个非常棘手的问题。

Moral education is a thorny problem that receives much concern.

道德教育是一个备受关注而又十分棘手的问题。

It is an thorny problem how to choose proper words as the subject of a sentence in Chinese-English translation.

在汉英翻译过程中，怎样选择适当的词语作句子的主语往往是一个棘手的问题。

The research builds on the concept of psychological distance, which is important for finding fresh approaches to a thorny problem.

这项研究的依据是心理距离理念，它对于为棘手问题寻找新方法很有意义。

Race relations in the USA continue to be a thorny problem

美国的各族关系依然是个棘手的问题