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 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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