For example, you might select a node and then drill down to add a predicate.
例如，您可以选择一个节点，然后钻取到查询中添加一个谓词。
A predicate is a partial expression that can be applied to an existing node set.
谓词是用于已有节点集的部分表达式。
A predicate is a partial expression that can be applied to an existing node set.
谓词是用于已有节点集的部分表达式。
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