查询历史事件数据(如果启用了可选事件存储，则可以通过发布的接口实现)。
Query historical event data (if the optional event data store is enabled, this can be achieved via a published interface).
不过，多重继承只能用在被认为可以减轻这一问题的接口实现中。
However, multiple inheritance being used only for interface implementation was thought to alleviate this problem somewhat.
通过引入针对该接口编写的代码并拥有多个接口实现，GWT编译器可以实施的优化将变得很少。
By introducing code written against the interface and having multiple implementations of the interface, there are fewer optimizations that can be done by the GWT compiler.
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