There can be up to 7 servers in a cluster, and any node can be the primary node.
一个集群最多可以支持7个服务器，并且任意节点都可以是主节点。
A primary node type defines the characteristics of the node, such as the properties and child nodes that the node is allowed to have.
主节点类型定义了节点的特征，例如允许节点拥有的属性和子节点。
The primary difference in tree-visitor is that the visit-node function returns several items: a new-node, a new-state, and a stop flag.
tree-visitor中的主要差别在于，visit-node函数返回多个项目：一个 new-node、一个new-state和一个 stop 标记。
This article assumes that we have a two-node cluster with Node1 as the primary node and Node2 as the failover/fallover/takeover/stand-by/secondary node, as shown below in Figure 1.
本文假设集群中有两个节点，Node1是主节点，Node2 是故障转移/接管/备用/辅助节点，见图 1。
The sentinel node (SN) is defined as the first draining node from the primary lesion and it has proven to be a good indicator of the metastatic status of regional lymph nodes in solid tumors.
信号淋巴结（SN）被定义为原发病灶的首站引流淋巴结，是判断实体瘤区域淋巴结转移的良好指征。
The sentinel node (SN) is defined as the first draining node from the primary lesion and it has proven to be a good indicator of the metastatic status of regional lymph nodes in solid tumors.
信号淋巴结（SN）被定义为原发病灶的首站引流淋巴结，是判断实体瘤区域淋巴结转移的良好指征。
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