rf fields
... (土地)改作住宅用途 rezoned for housing 无线电波电磁场 RF fields 无线电波加热器 RF heaters ...
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手机利用无线电波接打电话,而且这些无线电波会产生能被人脑吸收的电磁场。
Mobile phones use radio waves to send and receive calls and these produce small electromagnetic fields that can be absorbed by the head and brain.
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