But, if you are happy with your current iPad and don't see the point this incremental upgrade, you should save the money and wait for the redesign of the iPad 3.
但如果你对现在所拥有的iPad满意，并且没有看到升级版iPad的出色之处，你就应当攒下钱来，等待经过重新设计的iPad 3。
The data transform stage is separated, while provides data transform reuse mechanisms, who may save the rules and use its for extracting the daily incremental data, transform and loading;
将数据的转换阶段单独分离出来，同时提供数据转换重用机制，将那些可以重用的规则保存下来以便于日常增量数据的定时抽取、转换及加载；
The first time an object is sent to a client, it must include a full state snapshot, but subsequent updates can save on bandwidth by including only incremental changes.
如果是第一次发送给客户端，必须要包含所有状态的数据，后续的更新只需要包含增量的修改，以节省带宽。
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