这是因为本手机设计为可工作在多个功率级别上，以便仅仅使用所需要的功率来访问网络。

This is because the phone is designed to operate at multiple power levels so as to use only the power required to reach the network.

youdao

对于大多数功率脉冲发生器，其输出电压级别、占空比、使用寿命都是由开关器件的能力所决定的。

For most pulsed power generators, the output power level, the repetition rate, and the lifetime are determined by the capability of the switches.

youdao

论坛上对什么级别功率是安全，没有达到一致的认识。

The forums have had discussions about what power level is safe, with little consensus.

youdao