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————感谢书友【新月妖娆】、【爱情一杯酒】【就是有点蛋疼】的多次打赏。FlyWeightFactory is responsible for creating and managing meta-units. When a client requests, the factory needs to check whether there are eligible objects in the current object pool. If so, it returns the existing object. If not, it creates a new object. FlyWeight is a superclass. When it comes to shared pools, It is easy to think of JDBC connection pooling in Java, Considering the characteristics of each connection, It is not difficult for us to sum up: Applies to several objects that are shared, They have some common attributes, Take the database connection pool as an example, url, driverClassName, username, password and dbname, these attributes are the same for each connection, so it is suitable to use the meta-sharing mode to process, build a factory class, take the above similar attributes as internal data and the others as external data, and pass them in as parameters when calling methods, thus saving space and reducing the number of instances.For easier management, We can also create custom chains in a table, Place the rules set for an application in this custom chain, But custom links cannot be used directly, It can only work if it is called as an action by a default chain. We can imagine that, Custom chain is a relatively "short" chain. The rules on this "short" chain are all formulated for an application program. However, this short chain cannot be directly used, but needs to be "welded" on the default definition chain of IPTables before it can be used by IPTables. This is why the default definition "chain" needs to refer to "custom chain" as "action". This is a later remark. We will talk about it later. We can understand it more clearly in actual use.原第四季小组成员，免疫学家Dr.Allison Cameron（Jennifer Morrison）和重症监护医师Dr.RobertChase（Jesse spencer）将不会继续回应豪斯的召唤。卡梅隆升职去了紧急医疗中心，而蔡斯则去了普林斯顿平原市教学医院。第四季的末尾，一辆大巴发生了重大车祸。在一场迟到了4个小时的回想中，豪斯医生和他的队员们逐渐拼凑着他们的记忆，最终发现威尔森的女朋友Amber和他一起在车上并身负重伤。在豪斯医生和他的小队与为了Amber与死神赛跑时，他们却发现，对于Amber病情的明显恶化，他们竟然无能为力。吃惊的得知豪斯与Amber的死亡有直接联系，威尔森与他之间的友谊之桥轰然坍塌。一名政府刺客从退休中脱身，追捕负责杀死其团队前成员的外星人。