这可能是因为Kindle内置了手机数据传输网络，可以免费免费实现无线上网功能。
This is possible because the Kindle comes with free, built-in wireless Internet access, using a cellular data network.
netbook 是一种体型小巧、处理能力较低（按照现代标准衡量）但功能全面的笔记本电脑，通常支持无线上网。
A netbook is a small, underpowered (by modern standards), yet fully functional laptop, usually supporting wireless networking.
最有可能的元凶是手机或带有无线上网功能的电脑一类进行信号传输的设备，这些设备都发送电子脉冲或者电子波。
The most likely culprits are things that transmit a signal, like a cell phone or a computer operating in Wi-Fi mode, which emits an electronic pulse or wave.
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