What is the nature of light? Particle or wave? How fast is light speed? These are all basic questions of physics.

光的本质是粒子还是波？光速是多快？这些都是物理学的基本问题。

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Digital Particle Image Velocimetry (DPIV) is a technology for fast, full field velocity measurement.

粒子图像测速是一种快速全流场测量方法。

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A fast stochastic global optimization algorithm, particle group optimization algorithm, was used for training the fuzzy neural network.

模糊神经网络的学习算法采用的是快速的粒子群优化算法。

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So, let's see what the correct answer is, Wakefield and it is, in fact, Wakefield, right, because there's an inverse relationship between how fast a particle is going and what its wavelength is.

所以，让我们来看看,正确的答案是什么，事实上，答案是，因为粒子运动的快慢,与它的波长之间是一个反比例关系。

麻省理工公开课 - 化学原理课程节选

A clock tells you what time it is, but you can also say what time it is by seeing how fast the particle is moving because you know it started with some speed.

时钟能告诉你现在的时间,但你也可以通过测量质点速度,来判断当前的时间,因为你知道它的初速度

耶鲁公开课 - 基础物理课程节选

How fast is this particle moving?

那么这个质点的速度是多少

耶鲁公开课 - 基础物理课程节选

The probe is traveling so fast that a particle the size of a BB could destroy it, so researchers are worried about the broad debris field that Pluto's moons may have spawned.

MSN: New Pluto moon hints at perilous journey for spacecraft