Practical measurements result shows that secondary time server are better than primary ones from the perspectives of network delay.

实际测量结果表明，在网络延迟方面，二级时间服务器要优于一级时间服务器。

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Now query the stores_demo database and look for customer table at RS secondary server after 5 minutes of commit time.

现在查询stores_demo数据库，并在提交时间过去5分钟后在RS次要服务器上查找customer表。

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Lag time: the time the secondary server requires to confirm communication from the primary server.

Lag time：备份服务器确认来自主服务器的通信所需的时间。

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