When the page is first invoked, a default list of headlines is displayed, and there's a form field in which you can type your choice of news category before resubmitting the page.
当页面第一次被调用时，将显示默认的标题列表，并且有一个表单字段，您可以在其中键入选择的新闻类别，然后再重新提交页面。
You will also learn how to limit the user's choice of search parameters by placing a combo box on the page: this presents a list of selections to the user instead of allowing them to type in a string.
通过在页面上放置一个组合框，您可以限制用户对搜索参数的选择：组合框将向用户提供一组固定的选择，而不是任由他们直接输入一串字符。
Can someone tell me why I can't find the Graphics as a new item type and how to add it to the new item choice list?
谁能告诉我为什么我找不到图形作为一个新的项目类型和如何将它添加到新项目选择列表？
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