由于驱动程序维护与两个节点的连接，同时写事务被定向到主节点，因此读事务可以定向到任何一个节点。
Because driver maintains connection to both nodes while write transactions are directed to the primary node, read transactions can be directed to either node.
由于驱动程序维护与两个节点的连接，同时写事务被定向到主节点，因此读事务可以定向到任何一个节点。
Because driver maintains connection to both nodes while write transactions are directed to the primary node, read transactions can be directed to either node.
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