求翻译：振幅调制、解调与混频及常用的振幅调制、解调电路与混频电路，角度调制、解调原理及常用调频、解调电路等是什么意思？

Amplitude modulation, demodulation and mixing and common amplitude modulation, demodulation circuit and mixer circuit, angle modulation, demodulation principle and common frequency modulation, demodulation circuit, etc.

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The amplitude modulation, the demodulation and the mixing and the commonly used amplitude modulation, demodulate the electric circuit and the mixer circuit, the angle modulation, the demodulation principle and the commonly used frequency modulation, the demodulation electric circuit and so on

Amplitude modulation, demodulation, mixing and commonly used amplitude modulation, demodulation circuits and mixing circuit, angle modulation and demodulation principle and common, such as frequency modulation and demodulation circuit

Amplitude modulation, demodulation and mixing and common amplitude modulation, demodulation circuit and mixer circuit, angle modulation, demodulation principle and common frequency modulation, demodulation circuit, etc.