This class is a script interface for a particle renderer component.

这个类是粒子渲染器组件的脚本接口。

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Three soil characteristics are selected as family classification criteria. They are particle-size class, soil mineralogical type and soil temperature regime.

反映土壤理化性质并影响土壤利用管理的颗粒大小级别、矿物学类型和土壤温度级别是理想的土族分类标准；

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Though PM 2.5 as a class of particle clearly poses health problems, researchers have had less success assigning blame to specific types of particles.

虽然PM作为一类物质显然会引发健康问题，研究人员还未成功的让不同的特殊的小颗粒承担他们的过错。

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So what I'm saying here is we are specializing to a limited class of motion where the particle has a definite acceleration, a.

我在这里想说的是,我们正在专门讨论一类问题,这些问题中,质点都有一个确定的加速度a

耶鲁公开课 - 基础物理课程节选

The Alpha Magnetic Spectrometer was designed to search for dark matter by collecting high energy radiation known as cosmic rays, and then sort through it looking for a certain class of particle believed to be created after two bits of dark matter collide in space and destroy each other.

FORBES: Experiment May Have Found Dark Matter, The Key To A Cosmic Mystery