A new study published in the Journal of the American Medical Association has found that the radiofrequency waves emitted from mobile phones demonstrably alter brain wave activity.
在美国医学学会期刊上发表的一项最新研究发现手机发射的无线电波能明显地改变脑细胞活动。
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FOR radio transmission, inFORmation is imparted to a carrier wave by varying (modulating) its amplitude, frequency, or duration.
用于无线电传输时，信号用载波传送，通过改变(调制)载波的振幅、频率或间隔来实现。
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Basing on development trend of short wavefrequency hopping radio, this paper analyses some key techniques about the new type short wave digital frequency hopping radio.