Aristotle (384-322 BC) recognized the need for a conducting medium and stated that the means of propagation depended on the properties of the material.

亚里士多德(384 BC - 322bc)认识到传播媒介的重要性，并指出声传播的方式取决于材料的特性。

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The production method of the movie, its medium propagation way and effect produced by it make it become a kind of mass media.

电影的生产方式，它的媒介传播方式及这种媒介所产生的效果使它成为一种大众传播媒介。

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The model of wave propagation in functionally graded material (FGM) is introduced to soil medium, and the concept of functionally graded soil medium is brought forward.

研究了将功能梯度材料中应力波传播的计算模型应用到土介质中，提出了梯度土介质的概念。

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