You can tell by looking at the position graph (which shows an almost straight line) as well as the velocity graph where the slope clearly changes.

只要看看那条接近直线的时间-纵坐标图像和斜率明显变化的速度-时间图像，你就可以明白了。

youdao

Here, the velocity is almost constant — it's almost a straight line.

而在这里速度几乎是个常数了-，在这里接近一条直线了。

youdao

If all the forces acting on a particle are balanced, the particle will either remain at rest or will continue to move in a straight line at a uniform velocity.

如果作用在质点上所有的力是平衡的，质点将会保持静止或做做匀速直线运动。

youdao