这种方法使用可接受状态(共4种)的位掩码标志。
This method takes a bitmask flag of the acceptable states, of which there are four.
这样做的明显不利方面在于，用户将丢失所有应用程序状态，并将需要重新登录并重新创建该状态，而这对您的应用程序或业务需求来说也许是不可接受的。
The obvious down side is that a user will lose any application state and will need to log back in and recreate it, and this may or may not be acceptable for your application or business requirements.
哪怕适度的转变也可以产生一次症状的爆发——我非常悲伤的情绪揭示了一种“不可接受”的心灵状态。
Even a modest change can produce an eruption of symptoms distressing enough to reveal a state of mind that is "unacceptable".
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