难题

The machining and stiffness measurement of the key surface of feedback stick, taper surface, is a big problem in manufacturing of servo valve. And it is more serious in new model feedback stick, which is used in new generation carrier rocket and manned spacecraft.

反馈杆的关键表面——细长圆锥面的加工及其刚度检测一直是伺服阀生产的一大难题，对于新一代运载火箭和载人飞船所采用的新型号反馈杆，该难题变得更加突出。

The author's aim to unclose the problems one by one is to settle it, surpass it.

把这些困惑和难题一一剖开的目的是在此基础上，解决难题，超越困惑。

And now, gentlemen, we come to the vexed question of having to increase subscription charges to cove rising administration costs.

先生们，现在让我们来讨论提高认捐额以来解决不断上涨的行政开支这一难题。老师给孩子们出了一道难题。

The article first point out the factors which affect and restrict many people to brut private vehicle ,through analysis ,the present situation and the prospect of the private vehicle market in our country .the article finally analyzed the factors which restrict the car coming into each family this article proposed the reasonable counter-measures in the view of this difficult problem, and has unified the actual cases to make the automobile.

本文首先通过对国内私家车市场的现状及前景分析，指出影响制约私人购买汽车的主要因素的这一难题。最后对轿车进入家庭的制约因素进行了分析，本文针对这一难题，提出了较为科学合理的对策研究，并结合实际的成功的经销案例，使汽车快步走进千家万户。

After the establishment of socialist system in backward countries, these countries have to realize the industrialization and economic marketing in a relatively long period of time, which should have been realized in the capital system. This is the centurial problem facing the socialist movement in the 20~ century. However, theory of socialism primary stage provides a scientific standing point for solving the problem.

落后国家在社会主义基本制度确立以后，如何用一段较长的时间，来实现本该在资本主义制度下实现的工业化和经济的市场化，是20世纪社会主义运动所面临的世纪难题，而社会主义初级阶段论，为破解这一难题找到了科学的立足点。

In filtering dampish gases or gases containing sticky dust, the tendency of dust adhering to the filter bag has long been a difficulty of the industry until the engineers tried to replace the regular filter bag with tectorial filter bag or filter bag processed water-repellent.

利用袋式除尘器处理含湿量大或粘性较大的含尘气体，粉尘易粘附布袋一直是令除尘界头痛难题。国外曾尝试试用覆膜滤袋和对滤材表面进行防水处理解决防结露和布袋糊袋的难题，取得了明显的效果。

The disharmonious development between economy and environment, and the poverty in the rural areas are the main problems in constructing harmonious society.

构建和谐社会面临着诸多的难题，经济与环境的不协调发展和农村人口贫困就是其中典型的两大难题。

Firstly, some difficult problems required to be solved,such as the land surface parameters′ calculation and observation over inhomogeneous land surface and development similarity theory which can be applicable to the inhomogeneous land surface. Secondly, studies of the bulk transfer coefficients over humid regions of China must be strengthened. Thirdly, whether or not understanding the landatmosphere interaction process over inhomogeneous and complicated land surface in its entirety, the land surface parameters′ expandedness form local to regional scope is a critical and difficult problem.

在此基础上，探讨了该领域研究中存在的几点科学问题：①需要解决非均匀下垫面地表参数的计算和观测以及发展适用于非均匀下垫面的相似性理论等难题；②对我国湿润地区地表总体输送系数的研究需要加强；③能否对非均匀复杂下垫面陆气相互作用过程进行全面的认识，地表参数由&点&到&面&的推广是关键也是难题。

Objective Since plerosis of peripheral nerve injury is one of trauma surgery problems, screening ideal graft of accelerating neural regeneration is becoming the key of solution.

目的 周围神经的损伤和修复是创伤外科的难题之一，筛选理想的促进神经再生的移植物是解决这一难题的关键。

Well drilling in a salt formation is a problem in drilling,while accurately establishing the mud density and undersaturation is the key for solving the problem.

盐层钻井是钻井技术中的难题，准确确定钻井液密度及含盐欠饱和度是解决难题的关键。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。