Well, those are the three differences between a beam of ordinary light and a laser beam.

好了，那些是三个不同点在普通光束和镭射光束二者之间。

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The third difference is this: a beam of ordinary light diverges; a laser beam does not.

第三个不同点是：普通光束分离；而镭射光束却不然。

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Ordinary light, from the Sun or a light bulb, is emitted spontaneously, when atoms or molecules get rid of excess energy by themselves, without any outside intervention.

当原子或分子不受任何外界干涉释放自身多余的能量时，太阳和灯泡本能的发出的普通光。

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This is because most cosmologists reckon that the Big Bang could not have generated nearly enough ordinary matter--dark or light--to create a closed universe.

ECONOMIST: The dark side of cosmology

Gamma-rays are the most energetic form of light, with wavelengths far shorter than ordinary optical light (the light your eye can see), or even ultraviolet or X-ray light.

CNN: Why gamma-ray burst shocked scientists

It takes about an hour to collect and aggregate the data ( view a demonstration of a light pulse as it travels through an ordinary Coca-Cola bottle).

CNN: A camera that can see around corners