The escape operator may introduce an operator for example: back references, or a word operator.

转义符可以引入一个操作符，如反引用、词操作符。

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When using multiple back references, a regular expression can quickly become confusing and hard to understand.

当要使用多个反向引用时，正则表达式很快就会变得令人迷惑而且很难去理解。

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This Web service application will enable users to upload any number of files to the server and get references back to those files, as well as download the files they want using these references.

这个Web服务应用程序将使用户能够向服务器上传任意数量的文件，获得对这些文件的引用，还可以使用这些引用下载他们想要的文件。

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Now that the presidential candidates are talking to New Hampshire voters, don't expect many references back to corn and Hawkeyes.

NPR: Washington Experience a Liability for Democrats?

All of the references to the wide screen iPad idea either link back (eventually) to the Examiner post or list no alternate source.

FORBES: The Rumors Begin: Will The iPad 4 Have a Wider HD Screen, As Well?

Professor Rajan Gerta, from Mahatma Gandhi University in Kerala, said that there are many references to "ships coming with gold, and going back with 'black gold'" - pepper.

BBC: NEWS | South Asia | Search for India's ancient city