The fabrics are coated with nano-sized particles that repel stains.

这种织物表面覆有一层抗着色污染的纳米粒子。

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In other cases, the finer particles may be removed, while the sand-sized particles are accumulated to form mobile hills or ridges of sand.

在其他情况下，较细的颗粒可能被除去，而沙粒大小的颗粒堆积起来形成移动的山丘或沙脊。

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The laser shots created nanometer-sized particles in the air.

激光的射击在大气中产生毫微米大小的微粒。

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Earth is bombarded with more than 100 tons of dust and sand-sized particles every day, much of it falling into the oceans or remote areas, and otherwise going unnoticed.

WSJ: Meteorite Hits Russia, Causing Panic

The positrons, produced by the decay of radioactive sodium, are cooled into a similarly sized cloud of around 1m particles and held in a neighbouring trap.

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Several stages of cooling are needed to slow them down before they can be trapped, forming a matchstick-sized cloud of around 30, 000 particles.

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