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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An electrolyte is necessary to act as a conducting medium.

需要有一种电解质作为导电介质。

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For a given conducting medium, the delay is proportional to the length of the signal path.

对于给定的传导介质，延迟与信号通路的长度成正比。

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