Another scenario would be a dirty read where the value is in the process of being updated and another thread reads an old value.
另外一种情况是误读（dirty read），即一个数值正在被修改而另外一个进程读了一个修改前的值。
Another scenario would be a dirty read where the value is in the process of being updated and another thread reads an old value.
另外一种情况是误读（dirty read），即一个数值正在被修改而另外一个进程读了一个修改前的值。
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