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In addition to the thickness size specification, the strength lifting belt is also divided into single row and double row buckles. The quality of the strength belt depends on several indicators. One is the thickness. The thicker the better, at least the double layer is more than 10mm. There are also four layers of processing. The other is to look at the car lines. There must be at least four or more car lines. The more car lines, the better the hardness and durability.两位大佬该谈的都谈透了，就此一前一后踏上了赴北京与杭州的旅程。//and B methods; Method A and method B write specific business logic in subclasses in turn.所以这关中迟早还是越国的天下，从长远来看，与新主子保持好关系似乎是非常必要的。36岁的老卡仍然坚持着年少时就已经开始的说唱事业，可微薄的收入却让他的生活十分贫寒，为了孩子将来的生活能有所保障，妻子向老卡提出离婚。这时雪哥却来找老卡让他参加一个说唱比赛的节目，但被老卡拒绝了。雪哥苦口婆心地劝说，终于让老卡重拾信心，决定参加比赛，希望能赢得比赛，挽留妻子。小泽与反对自己玩说唱的父亲关系如同水火不容。直到身为出租车司机的赵父因为疲劳驾驶发生了车祸，才让小泽醒悟，彻底放弃说唱，和父亲一样成为了一名出租车司机。这时说唱比赛开始，小泽为了照顾父亲，选择放弃。却没想到，从父亲的盒子中得知父亲居然一直在为自己攒去音乐学院的学费。小泽十分感动，明白了父亲对他的希望，决定参加说唱比赛。Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.