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42. X.X.198Green: bluegrass (meadowgrass or poa) with turmeric, bluegrass and phellodendron*, kudzu*　　一次一次对立的任务，让他们慢慢的了解对方，慢慢的欣赏对方，各自在完成任务的同时，也在进行着相互策反。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.尹旭微一怔，急忙俯首谢恩。赐新重新把马友看作是事业上与爱情上的对手，于是向马友下了战书。百里香的存亡与爱情的选择使马友倍感压力……For the market, After all, the cultivation of children's thinking ability is still a new field in the education market. Although online children's English has cultivated a market for online learning, making many parents begin to receive online education, the development of the track still needs a process of cultivating the market because parents' awareness of thinking ability cultivation and online learning of thinking ability is not high enough. At present, most of the children's thinking ability line work class organizations still focus on word-of-mouth communication, WeChat circle of friends sharing and customer group fission in terms of marketing and promotion, and have not yet invested in large-scale marketing.