The final value that motion can take is linear, which keeps animation speedconstant.
最后，motion 属性还可以带的一个值是 linear，该属性让动画以恒速变化。
2
For example, in the universal testing machines, the motion between the fixed and moving crossheads can be controlled at a constantspeed.
例如，在万能拉伸试验机上，固定端和移动的十字滑块之间的变形是以恒定速度进行的。
3
The damage to the constantspeed of Hawkings radiation done by motion layer around black holes is expounded and it is the important reason for the latter to remain undetectable.