首先，通过大众传媒，我们对世界风云变幻了如指掌，否则我们就会一无所知。

First, mass media keep us well informed of the happenings of the world which would otherwise remain unknown.

youdao

首先，通过大众传媒，我们对世界风云变幻了如指掌，否则我们就会一无所知。

First, mass media keep us well informed of the happenings of the world which would otherwise remain unknown.

youdao