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约翰·达顿是达顿家族的一家之长，坐拥着美国最大的牧场，与牧场毗邻的有美国首个国家公园、印第安人保留地以及土地开发商买下的地皮。在一次因牲畜误入印第安人保留地引起的争端中，不幸的意外伤亡事件发生，一场涉及多方的争端在蒙大拿州这片美丽的土地上拉开了序幕。The unit of length is 12 inches per foot, the unit of weight is 12 ounces per pound, and the unit of weight is 12 pence per shilling. Even the imperial length of penalty kicks in football matches is 12 yards.奥斯卡·伊萨克饰演月光骑士/马克·史贝特具有分离性身份识别障碍，拥有性格迥异多重人格的他陷入埃及诸神的致命之战。赵锋大喜，一把扯住板栗衣袖，问道：你有主意？板栗不理他，耷拉下眼皮，只顾啃猪蹄。转身义无反顾地向北走去，没有丝毫的停留。? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?Let's expand the function promotion here.