这个行为虽然看起来很诡异，但事实上要使电子反抗外加电场及磁场的“推力”，道理却相当简单。
Although this behavior might seem paradoxical, it is actually quite a simple matter to make electrons oppose the "push" of the applied electric and magnetic fields.
球面辊子推力轴承结构简单，对环境要求相对比较低，但寿命较短。
Roller type thrust bearing can give simple design structure and easy to maintain and lower requirement of it's lubrication condition, but give shorter using life comparatively.
简单的防振动防手旋钮提供渐进式弹簧推力。
The simple vibration-proof hand knob provides progressive spring thrust.
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