我们重新命名了每个组合框小部件，以便在源代码中能够更好地区分它们，同时在每个组合框旁边放置一个标签，并使用标签文本对每个选项进行了说明。
We renamed each combo widget to make them easier to distinguish in our source code, and placed a label next to each one with a text word for each option.
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。
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.
例如，设计师需要特别考虑电视和组合音响放置的位置。
For example, the designer needs to know your idea about the position of TV and music center.
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