Let us consider a free particle.

让我们认为一个自由粒子。

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Let the discrete element method (DEM) be developed into the numerical simulation of 3d fluid-solid two-phased flows, the trajectory flexible model of particle group has been put forward.

将离散单元法(DEM)拓展到三维流固两相流的数值模拟中，提出了颗粒群轨道柔性模型。

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Manufacture on regenerated particle board by the scrap particle board and its products, the cause of pollution can be reduced and let wood resources repeated utilization.

研发以废旧刨花板及其制品为原料生产刨花板，既减少了污染源，又可使木材资源得到重复利用。

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If de Broglie is correct, we could then model the electron in its orbit not moving as a particle, but let's model it as a wave.

如果德布罗意是对的，那么我们可以在电子轨道中建立电子模型,不是像粒子一样运动，而是像波一样运动。

麻省理工公开课 - 固态化学导论课程节选

For example, let's take the case where the particle is falling under gravity.

比如说,举个例子,一个质点正在重力的作用下下落

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We said, "Let's take, for the simplest case that we can possibly imagine, namely a particle moving in one dimension along the x-axis with a constant acceleration a.

我们说过,"考虑我们可以想象的最简单的情况,即质点在一维空间运动,沿着 x 轴且保持恒定加速度 a

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