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Create multiple product objects in multiple product families. Q: How? A: Each specific factory creates multiple product objects in a product family, and multiple specific factories can create multiple objects in multiple product families.郑氏摆手，示意她们坐下，便进屋去了。九十年代末的中原内陆某小城，有一所封闭的武术学校。有一群少年在这所学校接受功夫训练和文化教育。 一天，有一位新的语文老师来到这里，开启了一段不寻常的经历……Fires cause huge losses to people's lives and property in our country every year. The application of flame retardant fabrics can effectively delay the spread of the fire. Especially in public places, the use of flame retardant fabrics can avoid more casualties. The difference between flame retardant fabric and ordinary fabric is that it can reduce the burning speed of textile materials to different degrees and stop burning quickly after leaving the fire source, which can reduce fire accidents caused by textiles and avoid unnecessary losses.徐晴看着他，忍不住眼眶就开始泛红，既憋屈又难受地叫了一声：哥……