noun · a person or thing that acts as a link, means of transmission, or vehicle for something else

语言是人类思想交流的媒介。

noun · the various channels or tools used for mass communication and the dissemination of information

这起事件引起了大众媒介的广泛关注。

noun · a biological organism, such as an insect, that carries and transmits a pathogen to another living thing

蚊子是传播疟疾等传染病的主要媒介。