空间运动

Based on the theory of gearing and differential geometry, a series of geometric relationships between conjugate tooth surfaces are analyzed, basic relationships of normal curvature as well as geodesic torsion between conjugate tooth surfaces are derived mathematically for the most general form of gearing.

基于微分几何和齿轮啮合理论，分析了共轭啮合齿面间的一系列几何关系，从而揭示了两个作空间共轭啮合运动的齿面之间的法曲率、短程挠率的内在几何联系。作为上述理论的具体应用，研究了准双曲面齿轮传动两齿面之间在给定参考点处的法曲率、短程挠率的关系

In order to make sophisticated cam mechanism into a visualized one and simulate its actual motion state, the equation of curved surface of the contour of globoid indexing cam was established by using spatial gearing principle.

为了将复杂的凸轮机构可视化，实时地模拟其真实的运动状态，利用空间啮合原理，建立弧面分度凸轮的轮廓曲面方程。

It is found that the spatially varying effects of the ground motions, especially the wave passage effect, have great influences on the dynamic responses of long-span structures.

研究表明，地震地面运动的空间变化效应对大跨度结构的响应有相当大的影响。

We point out the correspondences between Lie group, Lie algebra and some keyformulae of Huston-Kane method.

首次指出偏速度与偏角速度构成运动相空间的Lagrange子流形，揭示了偏速度与偏角速度的本质及Huston-Kane方法对动力学问题的变换思路。

We can't have enough space to have sports.

我们无法有足够的空间进行运动。

It is a kind of high concentration to give musical performance, create very strong labor in sex, is a kind of gathering the memory and thinks the elephant dint, reflect the dint and hear to argue the dint and feels dint in whole body of the development thinks with the combinative sport, sing a kind of note the endocentric emotion, the artistic that burn the life intense emotion gives musical performance the inside, we make an effort to polish a happy sentence, even each a note becomes blood contain meat, exquisite and perfect art article, educate an art of infinite thinks the elephant space, real use our music turn to have no a heartstring, this is the performer from cradle to the grave a kind of state pursued.

演奏是一种高度集中、创造性极强的劳动，是一种集记忆力、想象力、反映力、听辩力、感受力于一身的动态与静态想结合的运动，是一种倾注内心的情感，燃烧生命激情的创作演奏中，我们尽力把每一个乐句，甚至每一个音符都修饰成为有血有肉，精致完美的艺术品，造就出无限的艺术想象空间，真正用我们的音乐去拨动每一颗心弦，这就是演奏者一生所追求一种境界。

In system efficiency and motion correction ,the helical tomotherapy system had more room for development.

在系统效率、运动校正方面还有进一步的发展空间。

A helicoidal surface in Minkowski 3-space is defined as the orbit of a plane curve under a screw motion.

三维Minkowski空间中的螺旋面是一条平面曲线经由螺旋运动所生成的曲面。

The principles of forming toroidal gear have been studied and the trajectories of the machining tools have been obtained. Then, the generating method for manufacturing of the internal toroidal gear by using the envelope method has been proposed. Further, spatial meshing profile normal theory is applied to design the profile of the proposed hobber, and the fix angles of the hobbing cutter have been confirmed.

对内超环面齿轮齿廓的形成原理进行研究，得出加工刀具的运动轨迹曲线，提出包络法加工内超环面齿轮，并采用空间啮合齿廓法线法设计刀具廓形，确定刀刃切削角度，完成基于SolidWorks的刀具体三维造型设计。

Smooth the dirt in front of you with one foot; smooth the pocket in your glove; watch the eyes of the batter, the speed of the bat, the sound of horsehide on wood. If football is a symphony of movement and theatre, baseball is chamber music, a spacious interlocking of notes, chores and responses.

你用一只脚搓搓土地；用手擦擦手套上的球套；看着击球手的双眼，体会击球棒的速度，听着击打木棒时的声音，如果美式橄榄球是运动的交响乐，那棒球则是一曲室内音乐，音符在空间中交织、合声、回响。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。