该模块下载并解析xml，以可迭代对象形式返回信息，以便输出项标题和链接地址。
The module downloads and parses the XML and returns the information as an object that you can iterate over to print out the item title and link address.
软件可以自动抽取网页标题，获取网页的url链接地址，并将标题按照字顺排序。
Software can automatically extract page titles or headings, retain their page URL links, and sort them alphabetically.
指定发件人和收件人的电子邮件地址、标题和消息。
Identify the email address of the sender and recipient, as well as a subject and message.
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