零件

The third chapter studies the process of dynamic simulation and assembly based upon geometric constraints and probability set. Improvements of the constraint recognition and confirmation, as well as movement navigation are proposed. Real time interference detection is implemented.

第三章研究了基于几何约束可能集合的动态仿真装配零件的过程，改进了约束识别、约束确认和运动导航的算法，实现了实时干涉检测。

Detail drawing ; Dimension and tolerance representation ; Geometric epresentation ; Geometric modelling ; Information input processing ; CAD/CAM

零件图；尺寸公差；几何表达；几何造型；信息输入处理；计算机辅助设计/计算机辅助制造

In this paper, the recognition algorithm on geometric shape feature is introduced.

研究了基于图形信息的零件相似计算方法。

The bow is a simple weapon—firearms very complicated things, which ca n get out of order in many ways; the piece clogs and fouls easily, is liable to breakage, and can only be repaired by a skilled gunsmith.

弓箭是非常简单的武器---火器则非常复杂，很容易发生各式各样的故障。零件容易堵塞或者沾染赃物，容易泄漏，并且只能被专业的工匠修理。

The bow is a simple weapon—firearms very **plicated things, which can get out of order in many ways; the piece clogs and fouls easily, is liable to breakage, and can only be repaired by a skilled gun**ith.

弓箭是非常简单的武器——火器则非常复杂，很容易发生各种各样的故障。零件容易堵塞或者沾染脏物，容易泄漏，并且只能由专业的工匠修理。

6Yj%h'bKW （The bow is a simple weapon—firearms very complicated things, which can get out of order in many ways; the piece clogs and fouls easily, is liable to breakage, and can only be repaired by a skilled gunsmith.

r2N3WG 2。弓箭是非常简单的武器——火器则非常复杂，很容易发生各种各样的故障。零件容易堵塞或者沾染脏物，容易泄漏，并且只能由专业的工匠修理。

Such belief had brought public fear concerning the machinery parts, gigantism, excessive noise and speed created by mechanical arts.

意大利马克思主义社会理论家葛兰西相信机械化带来的标准化会威胁到个人的独特性，这样的信念引起大众恐慌，害怕机器会把人类逐出自然界，至使环绕于周遭的都是人工物品：机械零件、制式化环境、巨形、过度噪音与速度。

In general, gimbal parts of simple , massive shapes will offer greater potential for dimensional stability

通常，具有简单而结实的形状的框架零件提供良好的尺寸稳定性的可能性较大。

For example, the manufacture of high-pressure valve components in general should try to use forged or welded parts, to ensure GLOBE VALVE the material has good mechanical properties.

例如，制造高压阀门的零件一般应尽量选用锻件或焊接件，以保证材料具有良好的力学性能。

The production of globoid indexing cam and gas engine burningchamber are employed as refrences to analyze the method to mathematical modeling of complexed functional feature, furthermore, the research work of the character of surface feature production is deeply done .Advancing and optimizing the producting process, as well as the whole simulated machining by making UG NX2. 0 as the supporting system. Building the Fixture Library CAD/CAM Document system and producting template of DMU70V. Exploring the structure and flow chart of the Document System;Developing the MDF File by means of GPM module. All the above provide profound preparation to establish a further integrated manufacturing environment around 5-Axis NC production center.

在本文中，综合论述了特征建模的方法，以弧面分度凸轮和内燃机燃烧室作为实例，重点研究了复杂功能曲面的建模及曲面分析方法；并从五坐标加工角度出发，详细研究了曲面零件的加工特性，提出并优化了具体的工艺过程；利用UnigraohicsNX2.0作为开发工具，对建模和加工过程进行了全程仿真；围绕DMU70V建立了专属夹具库、文件体系及工艺模板；综合规划了五坐标数控加工的CAD/CAM文件体系的结构和运作流程；开发了GPM五坐标后处理DMF文件，为建立以五坐标数控加工中心为主的加工体系打下了良好的基础。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。