请注意，清单3未表示任何文件位置或URL，允许您转到其他目录位置，而无需更改依赖项列表。
Notice that Listing 3 includes no indication of file locations or URLs, letting you move to different repository locations without needing to change the list of dependencies.
helper 函数允许列表的顶部和底部包含任意的HTML ——它们在前面的布局正文片段（清单2）中是 :top 和 :bottom。 生成的 HTML 类似于清单 7。
The helper provides options for arbitrary HTML to be included at the top and bottom of the list — you saw them in the earlier snippet from the layout body (Listing 2) as :top and :bottom.
helper 函数允许列表的顶部和底部包含任意的HTML ——它们在前面的布局正文片段（清单2）中是 :top 和 :bottom。 生成的 HTML 类似于清单 7。
The helper provides options for arbitrary HTML to be included at the top and bottom of the list — you saw them in the earlier snippet from the layout body (Listing 2) as :top and :bottom.
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