propagation medium meaning in Chinese

传播介质
传播媒介
传播媒质

Effect of propagation medium property on time - frequency characteristics of blasting vibration with wavelet packets analysis
传播介质特性对爆破震动信号分析中小波包时频特征的影响
As one of the most popular and effectual propagation medium at present , the television undertakes the important population policy propaganda task
作为目前最大众化、最具效力的传播媒介之一，电视承担着重要的人口政策宣传任务。