此方法让它重建模型中数据的内部表示。
This method causes it to rebuild its internal representing of the data in the model.
完成此操作的一种简单方法是缩小要表示的数据范围，让其范围全部能用0到100的值来表示。
One simple way of accomplishing this is narrowing the scale of the data to be represented so it all fits in 0-100 values.
此属性表示需要一个事务，并且如果事务不存在，则由方法启动。
This attribute indicates that a transaction is needed and will be started by the method if one is not already present.
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