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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.The other two schemes are based on SYN cache and SYN? Cookies (see 6.4), simplifies the state initialized when the TCB is generated by receiving the SYN, and delays the instantiation of the full state [4]. In hosts that use SYN caching, a HASH tablespace with a limited size is used to store a subset of data that will be allocated to the TCB. If the ACK is received when the handshake is completed, the data will be copied into a complete TCB, otherwise HASH values exceeding the lifetime will be recycled when needed. In Lemon's FreeBSD, the SYN cache is 160 bytes for a half-open connection, while a full TCB is 736 bytes and supports 15,359 SYN cache spaces.单是要两位小姐跑单独逃离也不放心。故事主要讲述了从小被爸爸严加管教导致有些“叛逆”的少女双双在离家出走追求梦想的时遇见了一个才华横溢却冷漠敏感的男人齐勋。齐勋由于儿时的一场意外车祸与妹妹都获得了非同寻常的能力，也正是因为这样的能力，妹妹齐恬始终处于命悬一线的状态，这使齐勋在遇见双双后开始怀疑并调查她是否是救齐恬的“解药”，当他确认双双就是自己苦苦寻找的那个人时，却发现自己已经爱上了双双，主人公们逐渐陷入进退两难的境地：齐勋是选择恋人还是妹妹，双双是选择牺牲还是逃避，昆蓝是选择齐恬和双双,齐恬是选择活下去还是成全哥哥....所有角色都在“爱”的抉择中受伤，却又在学会成长…Chapter 9 Creating a New World with Deliberate Practice星海放出郭寒加盟的消息后，就开始对《魔都》大肆宣传。