Synchronous availability guarantees that the data sources on primary and secondary systems are identical, and complete data continuity is maintained after a failover.
同步可用性保证主系统和辅助系统上的数据源是一致的，完整的数据连续性是在故障转移之后维护的。
The reason is that because the calls are synchronous, the client application must wait for the server to complete the procedure before it can proceed further.
这是因为调用是同步进行的，客户端应用程序必须等待服务器完成该过程才能执行进一步处理。
All the service requests are probably synchronous and complete in a reasonable span of time (for example, seconds or less).
所有的服务请求可能同步并在合理的时间范围内(比如，数秒或更少)完成。
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