One limitation that applies to hubs and switches alike is that an Ethernet network must be loop-free.

集线器和交换机有同一个局限，即以太网网络必须是无路由循环的。

youdao

A: Try Loop PDF - it's a free service that lets you combine multiple documents, images and even web pages into a single PDF file.

A：你可以试试Loop PDF，他们提供免费服务，可以将多个文档、图片、甚至网页合并进一个PDF文件。

youdao

This paper proposes the concept of Minimum Closed Loop of free curve set, and presents two properties of Minimum Closed Loop.

文章提出了自由曲线集最小闭环的概念，给出了最小闭环的两个性质。

youdao

The firm maintains that it had been pitching its patented noise cancellation to Apple in periodic meetings between 2007 and 2010, only to watch as 1 Infinite Loop used Audience's technology for the iPhone 4 instead -- and supposedly handed some of Noise Free's work to a competitor.

ENGADGET: blogger-avatar

Ireland have a move where fly-half Jonathan Sexton runs around Brian O'Driscoll to take the return pass on the loop and free the runners out wide.

BBC: Six Nations: Jeremy Guscott on Ireland v England