They have a huge role in oil, mobile communication, media, textile, retail and more.
它们在石油、移动通信、媒体、纺织、零售等领域发挥着巨大作用。
可汗学院公开课：英语语法
Because before mass transit, and mass communication media, which William Caxton was a part of because he was one of the first English language printers.
Media (the singular form of which is medium) is the collective communication outlets or tools that are used to store and deliver information or data. It is either associated with communication media, or the specialized mass media communication businesses such as: print media and the press, photography, advertising, cinema, broadcasting (radio and television) and publishing.