规则和类转化为三类节点：规则节点(rule nodes)，类节点（class nodes）和中间节点（intermediate nodes）。中间节点介于规则节点和类节点之间。
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intermediate lumbar lymph nodes [解剖] 中间腰淋巴结
intermediate external iliac lymph nodes [解剖] 髂外中间淋巴结
intermediate common iliac lymph nodes [解剖] 髂总中间淋巴结
intermediate lacunar lymph nodes 腔隙中间淋巴结
intermediate network nodes 网络中间节点
There are no cases in a healthy cluster where messages inside the cluster hop through one or more intermediate nodes before arriving at their destination.
在健康的集群中，不存在消息经过一个或多个节点才达到目的地的情况。
If you must use descendant selectors, prefer child selectors, which at least only require evaluation of one additional node, not all the intermediate nodes up to an ancestor.
如果您必须使用后代选择器，尽量使用子代选择器，这最少只需评估一个额外的节点，而非中间直至祖先的所有节点。
They provide the capability of executing code inside intermediate nodes.
主动网络为中间节点提供处理代码的能力。
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