Peer-to-peer systems are often implemented as an abstract overlay network built at the application layer on top of the native or physical network.

对等系统常常实现为一个抽象的覆盖网络，构建于原生或物理网络之上的应用程序层上。

youdao

Internet piracy and illegal downloading from peer-to-peer systems are some of the biggest piracy problems in Europe, the MPAA argues.

CNN: Four found guilty in landmark Pirate Bay case

Other questions came from Labour peer Lord Touhig on IT systems used to administer for universal credit an from Conservative Baroness Byford on research and development work in food, environment and rural affairs.

BBC: Government defends 'stop and account' changes

By learning about the benefits from solar power systems from a trusted peer who faces many of the same local challenges (utility, construction, permitting options, siting), research from Yale and New York University demonstrates that social solar has already been shown to boost adoption rates by close to a percentage point.

FORBES: How Social Networks Are Fueling The Solar Boom