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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.The main contents of this program:对永堂的二个女人来说，他爱的那个《有情无份》，爱他的那个《有份无情》。既然“爱情”给了玉芳，能给丽淑的就只有“名分” 得到“名分”的丽淑，在忍受寂寞后，仍梦想拥有老公的“爱情” 得到“爱情”的玉芳，竟不时暗自垂泪，只因“名分”是那么遥不可及……优柔却也负责任的个性，注定了大老婆、小老婆之间的这二个家庭,一辈子说不清的矛盾与纠葛……(two) the medical service behavior is real, but the declared items and amounts are not consistent with the real service behavior, and the difference is not big;电影讲述的是一个经历残酷青春的少年为爱复仇不惜付出生命的故事。When Tony flew to the entrance of the cave with the bomb in his arms, Stephen's anger replaced sadness, but at the same time he was afraid to let go. He looked at the future and knew Tony would not die. In fact, as he saw, he was extremely angry.Your comments will promote the birth of the next article. Come and join us, guest officer, Mua Da ~ ~ ~.