Bitcoin is a form of digital money not supported by any government but exchanged by many people online.

比特币是一种数字货币，不受任何政府支持，但是很多人在网上交易。

The U.S. government is calling for Google to be broken up and forced to spin off at least its online advertising exchange and ad server for publishers.

美国政府要求拆分谷歌，并强制其至少对在线广告交易平台和广告服务器进行剥离，从而服务出版商。

Okay. So, I'll read you the the topic sentence: " Secondly, people are more motivated than ever to become politically active because they can freely exchange ideas online."

好吧。那么，我来读一下主题句：“第二，人们比以往任何时候都更有动力成为政治活跃分子，因为他们可以在网上自由交流思想。”