Momentum, Angular Momentum, and Dynamics of a System of Particles.

粒子的系统动力，角动量和动力学。

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Must use solid content filter to remove system of particles of pollutants.

必须采用固体物过滤器除去系统中的颗粒污染物。

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In addition, the theorem of moment of momentum about relative motion of the system of particles to the center of mo…

同时指出利用质点系绝对运动对动矩心的动量矩定理处理有关方面问题的方法更具有普遍性。

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But this antigen presenting cell is more likely a professional antigen presenting cell, or a subset of cells of your immune system that are specialized in ingesting foreign particles and displaying their contents to the rest of the immune system.

但这种抗原呈递细胞更加类似于,专职抗原呈递细胞,或者是体内免疫细胞中的一个亚群,专门从事吞噬异己物质,并告知免疫系统的其他细胞的工作

耶鲁公开课 - 生物医学工程探索课程节选

During Solar Max or solar maximum, the sun tends to exhibit more sunspots and eruptions, and jettison more solar flares, which send powerful streams of charged particles into the solar system.

CNN: Sun flips magnetic field

Scientists say these particles disturb the monsoon system and exacerbate the melting of snow and ice in the Himalayas.

BBC: South Asian bloc active at climate meeting

Matt Loxham, a medical biologist at Southampton University, collected minute dust particles of different sizes from at an underground train system in an unnamed European city.

BBC: Railway tracks