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- Axis Of Rotation: vector expressed in a given referential. ：给定参数的向量来定义轴向。
- Locations on the earth's surface are specified in terms of the earth's axis of rotation. 地面的定位是沿着地球的自转轴而定的。
- Structure passed by reference, that identifies axis of rotation of the quaternion. 结构,标识该四元数的旋转轴。
- Like Earth, the axis of rotation tilts 24. Hence, there are seasonal changes in Mars. 火星的自转倾角为24,和地球差不多,所以火星亦有四季变化。
- A similar great circle drawn on the surface of a celestial body at right angles to the axis of rotation. 天球赤道在天体表面与自转轴成直角的大圆
- The shoulder is another axis of rotation, and this axis is used in computing Shoulder Pull. 由于我们还借助肩膀的力量把球往上拉,肩部可以看成是第二个转动轴。
- Because the core current is somewhat symmetrical around the axis of rotation, the associated magnetic field is similar to that of a bar magnet. 因为地核流在旋转轴周围存在着一些对称，所以相关的磁场与棒磁铁的磁场相似。
- Magnetar's rotation axis of rotation around the second 60 weeks, it is super star after the explosion residues. 磁星每秒钟围绕旋转轴自转60周，它是超级大恒星发生爆炸后的残留物。
- We hold up our left hand and point our thumb in the positive direction of the axis of rotation. 我们握住自己的左手并且将自己的右手拇指朝向正旋转轴方向。
- The Geographic South Pole is where Earth's axis of rotation intersects its surface. 地理上的南极点是地球自转轴线与表面的交差处。
- Because the core current is somewhat symmetrical around the axis of rotation,the associated magnetic field is similar to that of a bar magnet. 因为地核流在旋转轴周围存在着一些对称，所以相关的磁场与棒磁铁的磁场相似。
- Moment of inertia: turning around its axis of symmetry, object has the character keeping speed and the direction of the axis of rotation not changing. 转动惯性:物体在绕着自己的对称轴转动时,具有保持转速和转动轴方向不变的性质。
- Taper support rib usually two or three cam roller contacts, in order to edge into the axis of rotation to be sent to the uniform output shaft. 锥度支撑肋通常与两个或三个凸轮滚子接触，以便入力轴的旋转可均匀地传送到出力轴。
- Pole shifts are a cataclysmic inversion of the planet's axis of rotation, up to180 degrees; a sudden slippage of the planet's solid crust around the molten core. 磁极转换是行星旋转轴的大变动倒置，等于180度翻转；在熔化的地核周围行星固体外壳突然意外的滑移。
- Dynamic equilibrium: if the axis of rotation of the rigid body is the principle axis of inertia, the additional dynamic reaction force of the bearing is zero. 静平衡：刚体转轴过质心，则刚体在仅受重力而不受其它主动力时，不论位置如何，总能平衡。
- Birds and compasses know north from south because, like a giant bar magnet, the earth's magnetic field has two poles that line up closely with the planet's axis of rotation. 候鸟与指北针都知道何为北方、何为南方，因为地球就像一条巨型磁铁棒，它的磁场有两极，且这两个地磁的磁场线和地球的自转轴非常接近。
- Pole shifts are a cataclysmic inversion of the planet's axis of rotation, up to 180 degrees; a sudden slippage of the planet's solid crust around the molten core. 磁极转换是行星旋转轴的大变动倒置，等于180度翻转；在熔化的地核周围行星固体外壳突然意外的滑移。
- The axis of a circle is its diameter. 圆的轴线是其直径。
- The Sweet Spot is known to cognoscenti as the "center of percussion." It is dependent on the location of the axis of rotation at the hand in the stroke (see formula for sweet spot location). 甜点的定义就是击球点（这么说不很准确，稍后会有说明），甜点处于我们上文描述的第一条轴线上。
- The moment of a force;the measure of a force's tendency to produce torsion and rotation about an axis, equal to the vector product of the radius vector from the axis of rotation to the point of application of the force. 转矩，力矩一种测量产生扭转和绕轴旋转趋势的力的单位，等于从旋转轴到力作用点的旋转矢量
