The “carrier”, in this case, is any shared transmission medium that carries data – copper wire in the case of ethernet, and the air carrying radio waves for WiFi.
在这种情况下，“载体”是任何承载数据的共享传输介质——在以太网的情况下是铜线，在 WiFi 的情况下是承载无线电波的空气。
Transmission medium
原声例句
科技 Crash Course
中文百科
介质
一种物质存在于另一种物质内部时，后者是前者的介质。
某些波状运动，如声波、光波中，则称传播的物质为这些波状运动的介质。
介质分为光介质、电介质、机械波介质、磁介质等等。
英语百科
Transmission medium 介质
A transmission medium is a material substance (solid, liquid, gas, or plasma) that can propagate energy waves. For example, the transmission medium for sounds is usually air, but solids and liquids may also act as transmission media for sound.
The absence of a material medium in vacuum may also constitute a transmission medium for electromagnetic waves such as light and radio waves. While material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance by absorption or by reflection or refraction at the interfaces between media.
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