Template methods can be provided by the implementer, who must not forget that the superclass can potentially have implemented its template methods.
模板方法可以由实现者提供，但必须注意的一点是超类有可能已经实现了其模板方法。
Template methods can be provided by the implementer, who must not forget that the superclass can potentially have implemented its template methods.
模板方法可以由实现者提供，但必须注意的一点是超类有可能已经实现了其模板方法。
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