The last piece of analyzing a change in speed is to think about mass.

分析速度变化的最后一步是考虑质量。

Loeb believes that this could explain the object's long, thin shape, and also its change in speed.

勒布认为， 这可以解释物体细长的形状，以及它的速度变化。

It's a supplement to the physician evaluation and the normal criteria that we follow changes in speed, memory, concentration, reaction time and eye movements.

这是对医生评估的补充，也是我们跟踪速度、记忆、注意力、反应时间和眼球运动变化评估的正常标准。

Changes in speed or direction, daily experience tells us these seem to have value even without other objects as reference points.

速度或方向的变化，日常经验告诉我们，即使没有其他物体作为参考点，这些似乎也有价值。

A change in course is more obvious than a change in speed when giving way to a ships crossing your path.

当给横穿你的路径的船只让路时，航向的改变比速度的改变更明显。

The scientists discovered that the waves move back at a constant rate, which means that they can estimate how long it takes for the change in speed to travel all the way through the crowd.

科学家们发现， 波浪以恒定的速度向后移动，这意味着他们可以估计速度的变化在人群中一路传播需要多长时间。

And since a quick transition from positive to negative G-force can result in whiplash, headaches, and back and neck pain, they avoid the extreme changes in speed and direction so common in thrill rides of old.

由于从正 G 力快速过渡到负 G 力会导致挥鞭伤、头痛、背部和颈部疼痛，因此他们避免了在过去的刺激游乐设施中常见的速度和方向的极端变化。