All substances are composed of a great many particles called atoms.

一切物质都是由大量称作原子的粒子构成的。

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As is known to all, the world is made up of small particles called atoms.

众所周知，世界是由叫做原子的小微粒组成的。

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Most people are familiar with the idea that matter consists of very small particles called atoms.

大多数人都熟悉这样一个概念，物质是由叫做原子的极小粒子组成的。

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The way Dr Hau and her team have slowed down light by a factor of 600 million or so is to use a group of atoms called a Bose-Einstein condensate (BEC).

BBC: A Bose-Einstein condensate: It slows down light

Nerve cells transmit their signals using electrically charged atoms (called ions) of sodium and potassium, which work rather like electrons in a metal wire.

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Their H2O turns into H (ie, hydrogen atoms) and OH (so-called hydroxyl molecules).

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