求翻译：D. Navigation element 1 Navigation element 2 是什么意思？

D.< @ 主语言 %="C#"MasterPageFile="~/parent.master"%大于<asp:content runat="server" contentplaceholderid="article"> <asp:contentplaceholder id="pagebody" runat="server">导航元素 1<br>导航元素 2<br> </asp:contentplaceholder></asp:content>