Two of the elements are empty containers to be used as loading points for the returned XML from the search engines.

其中两个元素是空容器，用作搜索引擎返回的XML 的加载点。

youdao

Two of the elements are empty containers to be used as loading points for the returned XML from the search engines.

其中两个元素是空容器，用作搜索引擎返回的XML 的加载点。

youdao