三分钟后，池维护线程运行。
三分钟后，池维护线程再次运行。
Three minutes later, the pool maintenance thread runs again.
如果在这3分钟内将连接放回空闲池，则Connection Manager将立即从池中再次取出它，并将其传递给应用程序。
If a connection is put back in the free pool within this 3-minute period, the connection Manager immediately takes it out of the pool again and passes it to the application.
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