另外，应用程序还可以在脱机模式或网络链接很慢的情况下工作。
Additional, applied process still can be in off line mode or network link work below very slow circumstance.
在脱机模式下，无需更改代码，所有服务请求就会自动转到本地缓存。
In offline mode, all service requests automatically go to the local cache without requiring changes to your code.
因此，这种机制要求客户端在切换到脱机模式前至少联机一次。
Therefore, this mechanism requires the client to be online at least one time before switching to offline mode.
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