难以控制

He's got technique, control, good tone and that elusive quality called "feel".

他拥有技巧、控制，有美丽的音色，还有一种难以触摸的特质，就是我们所谓的「feel」了。

However, because of the natural characteristics of the micro and small hole EDM, such as weak discharge energy, high pulse power supply frequency, unstable spark discharge states and small discharge gap, etc., there are still some key technical difficulties in its machining process need to be solved: the difficulties in real-time discharge states detection, in accurate control of machining process, in prediction of discharge states, in improvement of machining system precision and in on-line preparation of micro electrode, etc.

但是由于微细及小孔电火花加工自身具有的放电能量极微、脉冲电源频率高、难以获得稳定的火花放电状态以及放电间隙极小等固有特性，决定了其加工过程仍然存在放电状态实时检测方法单一、加工过程难于准确控制、放电状态难于预测、加工系统精度提高困难和微小电极在线制备困难等关键性技术难点，亟待突破和解决。

Roll wear is a factor difficult to determine and there is no suitable theoretical model till now In this paper,the theoretical model of roll wear is established from the view of tribology,and the roll wear on finishing train of 2050 CVC hot strip mill has been measured The calculated results agree well with the measured,so the model for roll wear is of important significance for shape control

轧辊磨损是当前生产中难以定量确定的因素，磨损预报至今尚无精确的理论模型可利用。本文从摩擦学原理出发建立了轧辊磨损的理论模型，并对宝钢 2 0 5 0 CVC热连轧机精轧机组的轧辊磨损量进行实际测量，计算结果与实测值吻合较好，对提高磨损预报精度、提高板形控制技术水平具有重要意义

The fan delta, sand beach, sand bars and turbidite fan in the TST of SⅡ and SⅢ sequences are the most favorable exploration targets because of favorable source - reservoir - seal assemblages. Since the high - stand system tract in SⅡ sequence has good source - reservoir assemblage and is covered by the regional seal of SⅢ sequence, the hydrocarbon accumulation in this area is controlled by the local seal rock. The HST of SⅡ sequence becomes the second favorable exploration target zone. Because the scales of the sand bodies of alluvial fan and braided river in low - stand system tract of SⅡ and SⅢ sequences are limited, the formation of a large hydrocarbon accumulation is difficult.

良好的生储盖配置使SⅡ层序、SⅢ层序水进体系域的扇三角洲、滩坝及浊积扇砂体成为本区最佳勘探目标层。SⅡ层序高位体系域生储条件配置好，又有SⅢ层序区域盖层的整体封盖，油气聚集受局部盖层直接控制，可成为较有利的勘探目的层。SⅡ层序、SⅢ层序低位体系域的冲积扇、辫状河砂体体积规模较小，难以形成大油气藏。

The main objective of the project is to strengthen the use of Chinese and non-governmental organizations and non-governmental organizations, civil society organizations through the use of the unique power to fill vacancies and AIDS Control Project in the expansion of existing coverage to the most vulnerable and hard-to-reach populations to provide the necessary Prevention, treatment and other support services.

项目的主要目标是利用并加强中国民间组织以及非政府组织的能力，通过利用民间组织的独特力量来填补空缺并扩展现有艾滋病控制项目的覆盖面，向最脆弱人群和难以接触的人群提供必要的预防、治疗以及其他支持性服务。

Classic PID control method which is based on precise mathematical model has poor adaptivity and is not adaptive to nonlinear and time-variant plants.

经典的基于对象精确数学模型的PID控制方法的自适应性较差，难以适应具有非线性、时变不确定性的被控对象。

The lack of management and maintenance controls and the difficulty in trying to deploy enterprise-wide applications to run on different client computers -- PCs, Macintoshes, UNIX workstations -- has reduced the benefits of client/server.

缺少管理和维护控制以及难以部署运行于不同客户计算机（pc 机、mac 机和unix工作站）的企业范围的应用程序，而降低了客户机/服务器带来的好处。

Unfortunately, client/server has proven more expensive and difficult to deploy and manage than government anticipated, The lock of management and maintenance controls and the difficulty in trying to deploy enterprise-wide applications to run on different clinet computers——PCs, Macintoshes, UNIX workstations——has reduced the benefits of client/server.

不幸的是，业已证明部署和管理客户机/服务器比政府预想的要更贵、也更困难。缺少管理和维护控制以及难以部署运行于不同客户计算机(PC机、MAC机和Unix工作站)的企业范围的应用程序，而降低了客户机/服务器带来的好处。

Goethe means to acknowledge a rhythmic inspiration so irresistible that it overpowered him even in the extremis of such circumstance.

歌德想要坦承的是：韵律灵感是如此难以抗拒，即便在这种场合的最紧要时刻都能征服和控制他。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。