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13(First Edition)The Original class is the original class, which contains the attribute value to be saved and creates a memo class to save the value value. The Memento class is a memo class, and the Storage class is a class that stores memos and holds an instance of the Memento class. This pattern is well understood. Look directly at the source code:第一次淞沪会战期间，苏州富家子弟周文与同学打赌，去前线慰问战士。在目睹了战争的残酷和中国军人的热血后，产生了弃笔从戎的念头。周文改名周卫国，参加了黄埔军校。因表现优异被派往德国军校，专修特种做战技术。在德国学习的过程中，他认识了日本派来的竹下俊。俩人在军校的学习生活中交为至交好友。1937年中日战争爆发，周卫国和竹下俊被召回各自的国家，两个好友最终无法避免在战场上兵戎相见的命运。周卫国归国后屡立奇功，却亲眼目睹了战友们相继死去，未婚妻也为避免日军侮辱，吞枪自尽。南京大屠杀后他逃出南京，决定北上参加八路军。周卫国到达抗日根据地，亲手训练出中国第一支特种作战分队屡立奇功，而竹下俊也组织了最精锐的日本特战队，与周针锋相对。最终，周卫国的特战队战胜了日本特种部队，将日军彻底赶出根据地，并迎来了抗战的最后胜利。When multiple connections are constructed, the number of connections to the server will soon reach the upper limit. Apache has 150 connections by default, so as long as we establish 150 such connections, Apache cannot process new requests and denial of service.