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Before SSL data transmission, both communication parties need to shake hands with SSL, negotiate encryption algorithm to exchange encryption keys, and carry out identity verification. Usually such SSL only needs one time, but there is a Renegotiation option in SSL protocol, through which the secret key can be renegotiated to establish a new secret key.Prototype method:出差拜访老同学美东著名的心脏外科医生钟立行，正遇上钟立行的妹妹车祸死亡。钟立行不能接受身为医生却无法救活妹妹的残酷现实而心理崩溃，武明训借机将钟立行带回国，请他回仁华医院建立心脏外科的声誉，增加他就任院长的砝码。不料钟立行的到来却在医院引起一连串的震动----他精湛的医术，专业的作风，对医生职业清教徒般的虔诚让全院上下无不为之吸引，也在武明训的妻子，麻醉科主任江一丹心中激起涟漪。《神秘博士》第13季宣布开拍。运作人Chris Chibnall透露新季将缩短为8集，因为该剧拍摄的复杂性，在新冠疫情下拍每一集所需的时间延长了，“不过《神秘博士》的雄心、幽默、乐趣和惊吓是不会少的。如今对全世界来说充满考验，但博士从不逃避挑战”。听见这粗声大嗓子，不用看，她就知道是那个当她面撒尿的汪老三。　　这件红旗袍流传下来，在当代人王泽亚（王良饰）和夏雪（洪辰饰）以及雅茹（秦雪饰）之间发生了一系列不可思议的恐怖悬疑事件，应验了红旗袍的诅咒。The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows: