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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Parents were quizzed about the types and frequency of the food and drink their children consumed when they were three, four, seven and eight and a half years old.

在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。

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Parents were quizzed about the types and frequency of the food and drink their children consumed when they were three, four, seven and eight and a half years old. They were marked on a.

在这些儿童三岁、四岁、七岁和八岁半时，研究人员向孩子的父母询问了孩子所摄入的饮食的种类，以及隔多长时间进食。

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David slays Goliath, but now this old plot is repeating with accelerating frequency.

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For example, rather than purchase expensive ultra-efficient motors, low cost opportunistic additions to old fans and pumps such as variable frequency drives and demand controls can deliver equal energy savings at a fraction of the cost.

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