Instant message is a new communication medium.

即时消息是一种新的通讯媒体。

Presentations are a powerful communication medium.

简报是强而有力的沟通媒介。

In particular, a communication medium is provided.

特别的，提供了一种通讯媒介。

Language use is never a transparent communication medium.

语言从来都不是客观透明的交际媒介。

Electronic mail is essentially an informal communication medium.

电子邮件是种不太正规的媒介。