The second broad category of network use is person-to-person communication, basically the 21st century's answer to the 19th century's telephone.

第二个利用网络应用的大类，是人对人的沟通，基本上是21世纪对于19世纪的电话的回应。

youdao

The second broad category of network use is person-to-person communication, basically the 21st century's answer to the 19th century's telephone.

第二个利用网络应用的大类，是人对人的沟通，基本上是21世纪对于19世纪的电话的回应。

youdao