Dirty reads: A1 is retrieving uncommitted data of a2.

脏读：A 1检索a 2未提交的数据。

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It allows you to change both droid and history and know that there will not be any dirty reads of the data.

它允许同时改变droid和history，并了解不会有任何对数据的直接读取。

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SQL 2005 has snapshot-based isolation levels that prevent readers from blocking writers or writers from blocking readers without allowing dirty reads.

SQL 2005有一个 基于快照的隔离级别 ，它能在不允许“脏读”的情况下避免数据读取阻塞数据写入，或者数据写入阻塞数据读取。

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