抑制高次谐波的产生，是手机设计中的关键。
The most important issue in mobile phone design is to suppress harmonics.
有限振幅的超声波在固体中传播时会发生波形畸变，伴随着高次谐波的出现。
Wave distortion will occur when finite amplitude ultrasonic waves propagate in elastic solids, resulting in the production of higher order harmonics.
对空载、带载情况下变频器产生的不平衡电压和高次谐波的含量进行了测试与分析。
Reference to research status of MDT and by analyzing the special working environment of the ESP, the multi-signal are carried with motor power line.
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