单件和静态状态已经因问题重重而被指责了多年。
Singletons and static state have been accused of being problematic for many years.
静态函数也可参与重载，但就返回类型而言，方法的静态状态不影响其签名。
Static functions may also participate in overloading, but as with return types, the static status of a method does not affect its signature.
最后证明了：系统可用动态状态反馈解耦，也可通过拟静态状态反馈进行解耦。
Moreover, we prove that if the disturbance decoupling problem is solvable by a dynamic state feedback, then it is solvable by a quasi static feedback.
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