Since Earth’s rotation rate varies, so would the value of one second when it’s defined as a fraction of the time it takes for one spin of the Earth on its axis.
由于地球自转速率发生偏离，因此当把地球绕中轴旋转一圈作为一个单位时，（这种偏离）就相当于一秒钟时间。
The parameter for the rotation is determined from the mouse for the particular axis.
旋转的参数是由特定轴上鼠标位置确定的。
What is the moment of inertia for rotation of a rod about this axis?
关于这个轴的,旋转动动量是多少？
Positive values for the angle rotate the object clockwise if you look along the positive rotation axis.
角度为正值，则表示若您顺着正旋转轴方向观察，对象是按顺时针旋转的。
The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
Of course, with the camera fixed to a tripod, the stars themselves produce concentric trails in long exposures, a reflection of the Earth's rotation around its axis.
当然用装在三角架上的照相机固定摄影，长时间曝光能拍到星星因地球自转而形成的同心圆轨迹。
It takes Earth 24 hours to complete a rotation on its axis, and roughly 365 days to complete an orbit around the sun.
地球要花费24小时完成绕地轴一周的自转，花费大约365天完成绕太阳一周的公转。
The idea is that the craft circles ourplanet at the same speed as Earth’s rotation about its axis.
这样做的目的是为了在地球自转的同时，使卫星能够绕地球同速转动。
For the moment of inertia, we want the square of a distance to the axis of rotation.
至于转动惯量，要求的其实是到旋转轴距离的平方。
The scientists were also shocked by data showing that Uranus' magnetic north and south poles were not closely aligned with the north-south axis of the planet's rotation.
领科学家震惊的是数据显示天王星的磁场南北极与行星的旋转南北轴线极不一致。
The dual axis rotation makes for super-clean clothes, and using the drum as a laundry basket helps users make sure that they are washing full loads rather than energy-wasting partial loads.
双轴旋转使衣物洗得更干净，而且圆鼓可以帮助用户确保衣物一次性洗完，而不是浪费能量的分批清洗。
However, if at birth the universe revolved around its axis in one direction, then the galaxies would have retained the rotation.
然而，如果在诞生之时宇宙就绕轴朝着一个方向运动，那么星系就应该保留了这样的旋转。
For rotation of the workpiece around the horizontal axis.
对于周围的水平轴转动工件。
Rationally define the work gear pump speed, gear and the axis of rotation to avoid engaging resonance frequency, can prevent noise intensified.
合理确定齿轮泵的工作转速，使齿轮与轴的转动避开啮合共振频率，可以防止噪声加剧。
If I take a rotation about the z-axis.
如果我在z轴周围取一个旋转。
Concretely, this curl gives you the angular velocity of the rotation, well, with a factor two but that doesn't matter, and the axis of rotation, the direction of the axis of rotation.
它给出了这个旋转的角速率，有一个因子2，但没关系，给出了旋转轴，和旋转轴的方向。
To reestablish the joint line and set the component rotation, we referenced the femoral epicondylar axis.
为重建正常关节线保证假体旋转，我们以股骨髁上轴为参考。
A gyro measures rate of rotation around a particular axis.
陀螺仪测量机体围绕某个轴向的旋转角速率值。
And we pass both high tides during each twenty-four-hour rotation of the earth on its axis.
地球自转24小时期间，我们就会经历两次的涨潮。
A complete rotation of the body around its vertical axis, as in diving and gymnastics.
身体绕垂直轴心完整地绕一圈，如在跳水或体操中。
Liquid crystals were chosen because their strong birefringence provides a simple way to observe their rotation around the laser beam axis.
选择液晶是因为它们强烈的双折射提供了一种简单的方法去观察它们绕着激光光轴的旋转。
The scanning mechanical device, including a bracket and the rotation axis, driven by a stepper motor.
扫描机械装置包括支架和旋转轴，由一个步进电机驱动。
Firstly, the Gauss map of points on the cylinder and a random sampling method are used to compute the rotation axis equation of the simple articulator.
首先通过构造圆柱面上点的高斯图和任意采样的方法，计算出简单牙合架转动轴线方程。
Low-voltage stepper motors, Japan THK's high precision guide linear, precision ball screw with the rotation. Single-axis CNC system operation, smooth running durable.
低压步进电机，日本THK高精度直线导轨，精密滚珠丝杠配合转动。单轴数控系统操作，运行平稳，经久耐用。
A new measuring instrument of rotational inertia has been devised by the fixed - axis rotation principle and parallel axis theorem of compound pendulum.
利用复摆定轴转动原理和刚体平行轴定理设计的一种新型转动惯量测定仪。
The plane rotation axis system adopted for the bridge is composed of plane rotation axis, inner and outer safety legs and plane ring slideway.
大桥采用的平面转动轴心体系由平面转动轴心、内外保险腿和平面环形滑道组成。
The paper proposes a new method of using the ultrasonic-speed turbine as a power sourse and using the magnetic suspension bearing as the main back-up bearing for the rotation axis.
本文提出用永磁材料制作的永磁悬浮轴承作高速旋转轴的主要支承，轴流式超音涡转作回转轴的驱动动力源。
The paper proposes a new method of using the ultrasonic-speed turbine as a power sourse and using the magnetic suspension bearing as the main back-up bearing for the rotation axis.
本文提出用永磁材料制作的永磁悬浮轴承作高速旋转轴的主要支承，轴流式超音涡转作回转轴的驱动动力源。
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