平均粒子数量的原水，沙过滤水和超滤水给出了图。

The average particle Numbers of raw water, sand filtrated water and ultrafiltrated water are given in Fig.

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你可改变这些粒子向下移动的速度，或增加粒子数量。

You could change the speed that these balls move down, or you could increase the number of balls.

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利用浓度场内空间粒子大小与透明度的逐渐变化，实现烟雾生成的逼真效果，达到降低粒子数量的目的。

It imposes gradually changing of special particle size and diaphaneity in density field, achieves realistic effect of smog, reaches the intent of reducing particle number.

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This will be the definition of the mole as the amount of carbon weighing exactly 12 grams, so I would like to know now how many particles, how many carbons are there in that mole.

摩尔的定义就是,12克的碳的数量，我想知道有多少粒子，一摩尔会有多少碳粒子。

麻省理工公开课 - 固态化学导论课程节选

So, we would actually need a really, really, really tiny velocity here to actually overcome the size of the mass, if we're talking about macroscopic particles, to have a wavelength that's going to be on the order.

是10的负34次方焦耳每秒,所以如果我们谈论的是要一个，宏观粒子有相应数量级的波长的话，我们需要一个非常非常非常小的速度来。

麻省理工公开课 - 化学原理课程节选