The energy of a particle or system of particles derived from position, or condition, rather than motion. A raised weight, coiled spring, or charged battery has potential energy.

粒子或粒子系统因其位置或状态而非运动而具有的能量。举起的重物、压紧的弹簧或充了电的电池都具有势能。

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The change in the momentum of a system of particles during an impact is equal to the vector sum of all the external impulses acting on the system.

碰撞时质点系动量的改变等于作用在质点系上所有外碰撞冲量的矢量和。

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This paper proposes the theorem of moment about mass acceleration of the particle and the system of particles (absolute motion and relative motion).

本文提出质点和质点系(绝对运动和相对运动)质量加速度矩定理。

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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