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就在此时，一个清脆的童音响起：娘亲，伯父和婶母请你过去用餐。The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?心系国家的老党员罗秉文响应国家号召将儿子罗家明送往边疆参加支边建设。在支边期间罗家明认识了同为支边青年的科研人员沈湘玥，并帮助沈湘玥所在的科室研究出了新型化肥，大大提高了生产力。同时他在机械工程师宋思逸的影响下，心系祖国机械工业发展，组建了边疆的机械队伍，为边疆的机械化生产奠定了基础。在此过程中，罗家明与沈湘玥两人互相帮助、彼此欣赏，共同克服了种种困难，正当两人几经磨难眼看将要修成正果之际，却因为各自的理想而不能继续共事一处，风雨飘摇中，两人的命运将走向何处……哦，我想吃那个从黑莽原带回来的鱼。他们对汉国多有怨言，自然而然地想要改善现在的待遇状况。(Ensures a stable number of methods in the Action class)