The block runs through all the sub-elements of the root element with the name item, specified by the XPath expression //item.
这个对象遍历所有带有item名称（通过XPath表达式 //item指定）的root元素的子元素。
The block runs through all the sub-elements of the root element with the name item, specified by the XPath expression //item.
这个对象遍历所有带有item名称（通过XPath表达式 //item指定）的root元素的子元素。
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