PM2.5 is of especially great health concern because it can penetrate deep into the lungs, but the researchers lacked the data to analyze those tiny particles separately.

因为它可以渗透到肺部深处，PM 2.5引起人们对健康的极大担忧，但研究人员缺乏数据来单独分析这些微小颗粒的实际影响。

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The finite element method is used to analyze the relationship between strength and stress of the particle reinforced iron matrix composites and the shapes, sizes and fraction volume of the particles.

采用有限元方法分析了颗粒增强铁基复合材料强度和应力与颗粒形状、尺寸以及体积分数的关系。

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The atmosphere dispersion theory was used to analyze the influence ol calm wind and gravity action on the diffusion of dust particles .

利用大气扩散理论分析了静风和重力沉降两种作用对尘粒在大气中扩散的影响；

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We collected those, although they're smaller and they're much fewer and they're much more of a challenge to find and analyze than the much larger comet particles.

NPR: Stardust Set to Deliver Comet Samples

The probe entered a special low-altitude orbit for about five months to allow the GRAND instrument to analyze emissions from Vesta's surface that result from collisions between cosmic ray particles and elements in the asteroid's dirt.

MSN: Surprisingly, giant asteroid Vesta covered in hydrogen