Heat sets these particles in random motion.

热量使这些粒子作随机运动。

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The random motion is usually neglected when evaluating the laser irradiation power.

一般估算辐照功率时常忽略目标的随机运动。

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Impulse and momentum change; rocket equation; origin of pressure from random motion.

冲量，动量的改变；火箭方程；随机运动的压力作用点。

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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.

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Brownian motion works best with truly random things, like little bits of pollen that bounce around with no rhyme or reason.

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