Marine creatures have that support provided free, by the medium they live in.

海洋生物可以通过它们生活的环境为媒介免费获得这种支持。

We know full well that the message is not transported by the medium of a hollow wire.

我们非常清楚， 消息不是通过空心电线传输的。

I was informed by the medium of the public prints that what I had taken had been recovered, and meetings were proposed in which I might hope to gain a great deal without the slightest risk.

我从公开刊物的媒体上获悉， 我所带走的东西已被找回， 并提议举行会议， 我希望在这些会议上能毫无风险地收获很多。