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First of all, we should be familiar with the mechanical mouse click it works: by moving the mouse to bring rubber ball, plastic ball and rolling friction in charge of the mouse with horizontal and vertical directions of the gate roller wheel, drive wheel rotation gate.

首先，我们应该熟悉一下机械鼠标的工作原理：通过移动鼠标，带动胶球，胶球滚动又磨擦鼠标内分管水平和垂直两个方向的栅轮滚轴，驱动栅轮转动。

It is not advisable to practice the violin mechanically and correct directions are necessary.

特别是小提琴在一切乐器中是最具有歌唱性的，它的每一根弦都具有明显的独特音色。

It is concluded that the melioration of land market trading order, the building of public platform and applying the existing system such as property rights and trading rules into the rural land market are the main melioration directions of future land market institutions.

研究结论：未来制度完善的主要方向是土地市场交易秩序的完善、公共平台的架构以及将产权基础、交易规则等既有的制度应用到农村土地市场中。

He and Beers formed a partnership which gave the National Committee on Mental Hygiene its initial directions.

他和比尔斯形成了一种伙伴关系，他们给国家心理卫生委员会制定了最初的方向。

Corresponding to the results of largest type Borel directions on the whole complex plane obtained by Zeng Fan-fu and Sun Dao-chun in paper [1],we discuss the case of unit disc and prove that there exists at least one largest type Borel point of K-Quasiconformal Meromorphic mapping with the finite positive order in the unit disk.

相应于曾繁富、孙道椿在参考文献[1]中获得的全平面情形的最大型Borel方向结果，讨论了单位圆情形，证明了单位圆内有穷正级拟亚纯映射至少存在一个最大型Borel点，推广了亚纯函数情形的相应结论。

In the case of a plane strain simulation, both the x and y directions need to be constrained for the meshed objects.

对于一个模拟机的压力，都需要X、Y方向的约束相对象。

Based on consider hereinbefore, this dissertation discusses several aspects on the problem of the sustainable and optimum exploitation of groundwater resources as follows:①reviewed entirely the origin and evolvement of the concept "sustainable development", stated and commented the study status in queue on"sustainable development"around national and international range, thorough discussed the science connotation about the concept "sustainable development";②looked back and commented across-the aboard some furthest basic concept and proposition related to groundwater resources, put forward self opinions on a few existent mistake points of view and chaos understandings;③expatiated entirely on the content and meaning of the theory of changeable groundwater resources system, contrast with the traditional methods of groundwater resources calculation and evaluation, combined example to show the application of this theory;④thorough analyzed the difficult and complexity to forecast the groundwater resources, fully stated the traditional methods of groundwater resources forecasting, pointed out the characteristic and applying condition of these forecasting method, introduced the main ideas and methods of wavelet analysis developed recently, and the MATLAB software be known as the fifths era computer language, and its accessory wavelet analysis toolbox, applied these methods and tools to analyze the groundwater dynamic curve, adopted the B-J method and Morte-Carlo method, combined with the theory of changeable groundwater resources system, discussed the new view on the forecast of groundwater resources;⑤synthetically analyzed the characteristics and limitations of the present all kind of groundwater manage model, combined mathematical programming, mathematical statistics, random process and the theory of variation system of groundwater resources on the unite optimum attempter of surface water and groundwater, emphasized how to make the model more nicety, more simple, more practicality;⑥analyzed the inside condition and outside condition to assure the sustainable and optimum exploitation of groundwater resources, the inside conditions are the follows: correct resources idea, scientific methods of resources calculation and evaluation, credible forecast methods of resources, exercisable measures of resources management, the outside conditions are the follows: the development idea of high layer, the transform of manage system, the matched policy and rule of law, the adjusted of economy lever, the improve of cultural diathesis, the boosting up of water-saving consciousness and detail measures, the control of population rising, the prevention and cure of water pollute, the renew and rebuild of ecology;⑦scan the sustainable and optimum exploitation of groundwater resources from the high level of metagalaxy, earth system science, and philosophy;⑧point out the more directions on groundwater resources.

它将为制定水资源的可持续发展目标和战略决策提供科学依据，为制定社会、经济可持续发展战略提供理论基础。基于以上考虑，论文主要从以下几方面对地下水资源可持续开发问题进行了比较深入的探讨：①全面回顾了"可持续发展"概念的由来与演变，对国内外"可持续发展"的研究现状进行了述评，并对"可持续发展"概念的科学内涵进行了深入探讨；②对涉及地下水资源的一些最基本的概念和命题进行了全面的回顾和评述，对目前仍然存在的一些错误观点和混乱认识提出了自己的见解；③全面阐述了地下水资源变值系统理论的内容和意义，并与传统的地下水资源计算评价方法进行了对比分析，结合实例具体说明了方法的应用；④深入分析了地下水资源预测预报工作的极端重要性和复杂性，对传统的地下水资源动态预测方法进行了全面的评述，指出了各类预测预报方法的特点及适用条件，对最近二十多年刚发展起来的小波分析技术的主要思想和方法及其应用范围，以及号称第五代计算机语言的MATLAB软件和附带的小波分析工具箱进行了介绍，并应用于地下水动态过程线的分析，采用时间序列中的B-J法，蒙特卡罗方法，与地下水资源变值系统理论相结合，探讨了地下水动态资料分析和地下水资源预测预报的新思路；⑤综合分析了现今各类地下水管理模型的特点及缺陷，将数学规划、数理统计、随机过程等与地下水变值系统理论相结合进行地表水地下水或多水源的联合优化调度，使模型更准确、更实用；⑥对保证地下水资源可持续开发的内部条件和外部条件进行了分析，内部条件主要是正确的资源观，科学的资源计算与评价方法，可靠的资源预测预报技术，可操作的资源管理措施，外部条件主要是高层发展思路、管理体制的变革、配套的政策法规、经济杠杆的调节、人文素质的提高、节水意识的增强及具体节水措施、人口增长的控制、水体污染的防治、生态的恢复和重建等；⑦从宇宙科学、地球系统科学及哲学的高度审视地下水资源的可持续开发；⑧指出了地下水资源可持续开发的进一步研究方向。

We can find the joints of the weakest stiffness and its directions by using the method of modified Guass elimination.

令每一个最弱劲度点的移动量为一单位，加上每支杆件长度不变的束制条件，得到对应的移动模态向量。

This article summarizes the domestic and foreign researches on the present situation and problem in rural area tourism. It also brings up the significance, directions, and methodologist of performing researches on rural area tourism.

本文首先对国内外学者对乡村旅游发展现状及存在问题的研究进行简单的概述，并提出乡村旅游的研究意义，以及乡村旅游的研究路线和研究方法。

A new metric form is chosen to study the Weingarten translation surfaces which are translating in the two null directions in a pseudo orthogonal frame.

在伪正交标架下，选取一种新的度量形式，对沿两个类光方向平移的平移Weingarten曲而进行了研究。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。