More to the point: we can use Derby as a powerful client-side cache for data from our servers.
更为重要的是：可以将Derby用作存储来自服务器的数据的强大客户端缓存。
With the user's permission, a Flex application can cache unlimited data on the client side, which reduces network round trips if the same data is requested again in the same or future sessions.
只要用户授权，Flex应用程序就能在客户端上缓存任意大小的数据，这在接下来的会话频繁请求相同的数据时减少网络数据的往返。
When you cache data on the client side using JSON, you update the data caching object every time the user clicks on the Add Vehicle button.
当使用JSON将数据缓存到客户端时，系统将在用户每次单击add Vehicle按钮时更新数据缓存对象。
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