尼古拉·特斯拉发明的感应电动机本质上就是一台旋转变压器——首先在电动机的固定钢制外壳（定子）上安装上绕组，然后将导体安装入内轴（转子）。
Tesla's invention is, in essence, a rotating transformer. Its primary windings reside in a stationary steel casing (the stator) and and secondary conductors are attached to an inner shaft (the rotor).
这个实验，我们用一种用平行轴固定的两台同步摄像机定位系统来跟踪一个三维空间中的移动物体。
In this experiment we use a stationery system with two identical cameras with parallel axes to track a moving object in three dimensional space.
如果齿条固定，小齿轮装在工作台的轴承上，而工作台所在的导轨与齿条平行，那么小齿轮的轴转动时，就会带动工作台平行齿条而移动。
If the rack is fixed and the pinion is carried in Bearings on a table guided on tracks parallel to the rack, rotation of the pinion shaft will move the table parallel to the rack.
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