Heat sets these particles in random motion.

热量使这些粒子作随机运动。

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The system input in this case is turbulent air which produces random pitching motion of the vehicle.

在此情况下，系统的输入是紊流大气，它使飞行器产生随机俯仰运动。

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The idea is that share prices follow some gentle random walk away from an equilibrium, rather like motes of dust jiggling around in Brownian motion.

其想法在于，股票价格遵循偏离均衡的相当温和的随机漫步（random walk）原则，颇似布朗运动（Brownian motion）[5]中四处轻摆的花粉微粒[6]。

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The new work focuses instead on cold, dense masses of gas that have markedly less random motion, and which emit their radiation in the microwave part of the electromagnetic spectrum.

BBC: Supermassive black hole weighed using new scale

It turns out that what Brown discovered called Brownian motion is useful in studying all sorts of random phenomena, including financial risk.

NPR: Why Risk Models Failed to Spot the Credit Crisis