Radiowaves are electromagnetic radiation that we can't see.

无线电波是一种我们看不见的电磁辐射。

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Though still able to cook food, its microwaves (essentially, short radiowaves) are modulated to encode information as though it were a normal radio transmitter.

虽然仍能烘烤食物，它的微波(本质上，就是无线短波)被调整以编码信息，就像是一般的无线电发报机。

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And similarly old crystal radio sets and more recently modern radio frequency identification (RFID) tags, increasingly used in shipping and as antitheft devices, are powered purely by radiowaves.

同样，老式晶体管收音机，以及日益普及于航运及防盗装置上的，更新式的现代无线射频识别技术(RFID)，都是仅仅从无线电波中获取能量。

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The machines use magnets and radiowaves to excite hydrogen atoms in body tissues, creating data that computers assemble into three-dimensional images.

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