Nodes in the virtual network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network.
虚拟网络中的节点可以认为是由虚拟或逻辑链接连接起来的，每个都对应一个路径，可能在底层网络通过多个逻辑链接。
We have listed some of the most commonly used links here, along with a brief description; perhaps not surprisingly, many of them point to this very column as a starting point.
下面我们列出了一些最常用的链接并提供了简短说明；也许您不会感到惊讶，有些链接将本专栏作为入门点。
Twitter is especially suited to sharing quick links, but its 140-character limit has perhaps done more than anything else to propel forward the use of URL shorteners.
Twitter特别适合分享快速链接，但它的140个字元限制也许是网址缩写服务的最大推动力。
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