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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.Copyright? Copyright 2002-2019 www.qidian.com All Rights Reserved Shanghai Xuanting Entertainment Information Technology Co., Ltd.R1 + Button-Special Skills:When a user opens a contact, an embedded DDE payload is executed.她和嬴子夜作为秦国皇室血统唯一的两个后裔，她自己没有孩子，唯有靠嬴子夜将血脉继续传递下去。The heel is thickened, which can increase the buffer when landing to a certain extent during movement, thus reducing the reaction force.本剧聚焦Theresa和Helen姐妹二人，她们害怕自己的孩子也许和社区里另一个小孩的失踪有关。AnnaMaxwellMartin和RachaelStirling饰演姐妹。