注意，一些多播地址可能是保留的。

Note that some multicast addresses may be reserved.

youdao

概念可以是单词、短句子、多单词的短语、数字、日期、URL、电子邮件地址或者文档中出现的任何有意义的东西。

Concepts can be words, short sentences, multi-word tokens, numbers, dates, URLs, e-mail addresses, or any other meaningful patterns that appear in the document.

youdao

信封上的地址是多伦多。

The envelope bore a Toronto address.

youdao