如果后端数据库失败，或者您的网络连接失败或较慢，您的应用程序可以继续运行，这种失败对于应用程序是透明的，不会产生任何影响。
If the back-end database fails, or if your network connection to it fails or slows, your application keeps running, and this failure is transparent to and does not affect your application.
如果您是在一个远程的便携式电脑上工作，或者在家里网速较慢的条件下工作，那么您可以选择在非连接模式下工作。
If you are working on a remote laptop or you are working from home with a slower connection, you can choose to work in disconnected mode.
查询本地数据库是一个比较慢的过程，特别是，如果您有多行数据或者您需要在多个表之间运行复杂的查询语句。
Querying a local database can be a slow process, especially if you have many rows of data or you need to start running complex queries that join multiple tables.
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