In the 1910's and 1920's many people "hacked" on crystal sets to take advantage of the new high tech world of radio.
在1910年和1920年，许多人“黑”掉水晶套，从而利用无线电的新高科技世界。
He remembers with perfect clarity building a crystal radio in his bedroom around 1920 and amazing his mother, who thought music came only from Victrolas, with the music he "caught for free."
他仍然清晰记得，1920年他卧室里的晶体收音机里收听到的免费音乐，给一度认为音乐只从留声机里来的母亲带来的震惊。
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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