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What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.Strategy mode refers to defining a series of algorithms, encapsulating them one by one, separating the unchanged part from the changed part, which is actually separating the use and implementation of the algorithm. The usage of the algorithm is unchanged, and the calculated bonus is obtained according to a certain algorithm, while the implementation of the algorithm corresponds to different performance rules according to performance.In the investigation, I found that "dot" is only a technical problem and is not difficult to solve. However, the livelihood issues behind the "dot" areEnsure that the patient's claim information is evaluated and met;　　朱凯西准备好爆米花，租好了恐怖电影录影带，正希望在这个父母外出的夜里，好好享受被惊吓的感觉。这时电影响起，一个陌生人却让她真正吓破胆，因为他知道她的一举一动，甚至在她面前活生生地将她男友杀死，最后连她自己都难逃厄运。汤姆·里皮斯基([年轻气盛])将与詹妮弗·康纳利、戴维德·迪格斯一起出演剧版《雪国列车》第二季的循环角色。《雪国列车》二季现正制作中。