Before the laser, scientists developed a similar device: a maser which stands for Microwave Amplification by Stimulated Emission of Radiation.

VOA: special.2010.09.01

You can be--it can be secured easily and it can be made easily in a microwave or things like that, that's all true. Any other ideas, yes?

你可以,垃圾食品保存方便而且,也能直接放在微波炉里或类似的手法烹调,这都是原因,还有其他的原因吗

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So that's the important take-away message from this slide. If we think about these different types of lights, microwave light, if it's absorbed by a molecule, is a sufficient amount of frequency and energy to get those molecules to rotate. That, of course, generates heat, so that's how your microwaves work.

重要的信息，如果我们看看,这些不同种类的光，微波,如果被分子吸收，它的频率和能量可以,使分子转动,这当然的，会产生热量,这就是你们微波炉的工作原理。

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