我们之所以要学习外语，是因为它们已成为引进先进思想和科学技术的媒介。
The reason why we should learn foreign languages is that they have become a vehicle for bringing in advanced ideas, science and technology.
高速的电子通讯媒介，如电子邮件和电视，往往会妨碍有意义和有思想的交流。
High-speed electronic communications media, such as electronic mail an television, tend to prevent meaningful and thoughtful communication.
它是我们同世界交流自己思想的媒介。
It is the medium we use to share our thoughts with the world.
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