除了利用原像计算避免误判之外，该算法还将可达状态和不可达状态引入到验证过程中。
It not only used pre-image computation to avoid false negative, but also incorporated reachable states and unreachable states in the verification process.
active状态意味着ConnectionManager激活服务；defined状态相当于停止状态，在此状态下，Connection Manager不启动服务，使之不可达。
Active state means the Connection Manager activates the service; defined is equivalent to down, in which case the Connection Manager does not start the service, making it unreachable.
active状态意味着ConnectionManager激活服务；defined状态相当于停止状态，在此状态下，Connection Manager不启动服务，使之不可达。
Active state means the Connection Manager activates the service; defined is equivalent to down, in which case the Connection Manager does not start the service, making it unreachable.
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