We label a group of particles occupying a small neighbourhood.

我们可标记占据某个小领域的质点群。

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The group has just issued a report, published by the Novim research organization, analyzing the use of aerosol particles to reflect shortwave solar radiation back into space.

该小组刚刚由诺文研究组织发布一项报告，报告分析了悬浮粒子的作用，即能把短波的太阳辐射反射回大气中去。

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The group also studied particle pollution levels emitted from these sources, which are made up of a mix of tiny solid and liquid particles in the air.

这个组织同样对从这些源头释放出的颗粒污染水平进行了研究。 它们由极小的固体和液体颗粒组成。

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Last week, a different research group unveiled new findings on the impact of volcanic eruptions, which pump vast amounts of particles into the air, some rising as far as the stratosphere.

BBC: More sulphur trails from the stratosphere