Constant current charging by switch control is the main method to generate non-sinusoid oscillation waveform.

采用开关元件控制的恒流充放电是产生稳定非正弦振荡波的主要方法。

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"Among current non-internet users, almost half (48%) say the main reason they don't go online now is because they don't think the internet is relevant to them -- often saying they don't want to use the internet and don't need to use it to get the information they want or conduct the communication they want, " said the report.

CNN: Why one in five U.S. adults doesn't use the Internet