Some classes retain state information from one method invocation to the next, and it is difficult to make such classes thread-safe in any practical way.
有些类保留从一个方法调用到下一个方法调用的状态信息，要在实践中使这样的类成为线程安全的是困难的。
Some classes retain state information from one method invocation to the next, and it is difficult to make such classes thread-safe in any practical way.
有些类保留从一个方法调用到下一个方法调用的状态信息，要在实践中使这样的类成为线程安全的是困难的。
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