Read transactions require a consistent view of the data -- meaning if two read transactions are submitted at the same time, they should produce uniform result sets if they select the same data ranges.
读事务需要数据的一致视图 —— 即当同时提交两个读事务时，如果它们选择相同的数据范围，那么应该产生一致的结果集。
Microsoft has kept its Office formats consistent enough through the years that the newer applications can read the older formats, and they are all easily identifiable.
这些年来，微软一直通过保持其Office格式一致，以保证较新的应用程序可以读取旧的格式，同时它们也都很容易识别。
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