旋转运动

Topspin or overspin is when the ball is spinning over itself in the direction moving forward.

上旋是指球在往前的运动中的自身旋转。

Motion of a body in which every point of the body moves parallel to and the same distance as every other point of the body; nonrotational displacement.

平移一个物体的运动，指该物体的每个点都平行于另一个物体每一个点的移动，并且距离相同；非旋转性位移

The rotating chute planetary gearing of eoordination type double pot bell less furnace top of 750m 3 blast furnace in Laiwu Iron and Steel General Works can make chute to do circular motion around contral line or blast furnace of to do inclined motion, and it can achieve ideal charging of throat.

莱芜钢铁总厂750m3高炉双罐并列式无料钟炉顶旋转溜槽行星传动系统使溜槽既可绕高炉中心线会圆周运动，又能倾动，实现了炉喉的理想布料。

A general contact algorithm for parallel finite element simulation of dynamic contact problem is presented in this paper.

引言工程领域存在大量动态接触问题，如旋转机械中运动部件与固定部件的摩擦、建筑物在地震或爆炸荷载作用下的破坏等。

This paper takes one low-speed-circumgyrate rocket with a empennage asa research object, set up a relevant reference frame, analyse the strength andmoment on the amended rocket, ratiocinate the sports equation with 6 DOF; analyse the factors which cause terminal windage between pratical trajectoryand fiducial trajectory, take certain rocket for example, make use of theemluator on the influence of estimating precision caused by measuredinformation, find the speed, the trajectory obliquity, the trajectory setoverand the coordinate are the sensitive factor arosing terminal windage of thetrajectory; introduce the developing status of detecting technique, and basedon the actuality, choose the radar in the ground as measure equipment; simplydesign and analyse the setting and inflame control of the impulse engine onthe amended rocket; design the amend method and validate its feasibility takingthe use of emluator.

本文以某型低速旋转尾翼火箭弹为研究对象，建立了相应的坐标系，详细的分析了作用在弹道修正弹上的力和力矩，由动量定理和动量矩定理推导出了在一般形式下的弹道修正弹的空间六自由度的运动方程；对引起弹道落点偏差的因素进行了分析，以某口径火箭弹为例仿真了可测信息量对估算精度的影响，发现速度大小、弹道倾角、弹道偏角和位置坐标是引起落点偏差的主要因素；对弹道探测技术发展现状作综合性阐述，并基于现状，选用地面火控雷达作为测量装置；对弹道修正弹上脉冲推力器的安装和点火控制方法进行了简要的设计与分析；设计了弹道修正弹指令修正的修正方法，通过数字仿真验证了方法的可行性。

Hard disk is a mechanical and electrical equipment, motor-driven disc through high-speed rotation, because of read-write head back and forth arm movement, so the hard disk mechanical components will be affected by inertia.

硬盘是机电设备，盘片通过马达驱动高速旋转，磁头臂因读写来回运动，因此硬盘会受机械部件惯性的影响。

The 28th international table tennis federation world after the modification of the rules , the ball from behind high ball down, so that can serve force is not legal service. In the 1960s, along with the development of tennis sport service quality is improved greatly, and pay more attention to the rotation speed, and serve the high toss service, but due to not to bring great threat returner and so on the new rules, not too many restrictions on serving technology.

第28届世乒赛后，国际"乒联"对规则进行了修改，规定了抛起的球从最高点下降时才能击球，因此认定合力发球是不合法发球。60年代随着乒乓球运动的发展，发球质量也有了很大的提高，更注重发球的旋转与速度，开始出现了高抛发球，但由于并没有给接球方带来很大的威胁，所以，规则并未对这些新的发球技术进行过多的限制。

Yes, thighs strain with effort, but I'm distracted by the twirling toes and the bleached teeth framed by rictus smiles.

是的，这两项运动需要力量，不过旋转的脚趾和露出皓齿的笑容令人分心。

It has long been known that the apex and base of the heart rotate about the left ventricular longitudinal axis in different directions during the cardiac cycle,resulting in a twisting,or torsional motion.

心动周期中心尖及心底沿左室长轴向不同方向旋转，引起心脏扭曲或扭转运动。

Walking brought along the lumbar vertebra to bend forward and rotate with the movement of right and left lower limbs.

步行带动腰椎向前弯曲并随左右下肢运动而旋转、侧弯，其主要作用力来自腰大肌。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失