用户必须从列表中选择一个节点，见图4。
Users have to select one from the list, as shown in Figure 4 below.
假设每个部门的子节点表示一组用户。
This is assuming that the children of each department represent a group of users.
如果用户为女性，那么她可能对“Woman”节点更感兴趣。
If the user is a female, she might be more interested in the "Woman" node.
不用输入密码就可以以根用户身份在节点之间以ssh 连接。
一个层次结构用户兴趣模型是一个以单个兴趣向量为节点的树。
A hierarchical user interest model is a tree whose nodes are the single interest vectors.
一个层次结构用户兴趣模型是一个以单个兴趣向量为节点的树。
A hierarchical user interest model is a tree whose nodes are the single interest vectors.
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