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Deliberate practice does not deny the importance of situation, but in some best sellers, the mainstream methods that have been confirmed by learning science are placed in a humble corner. Tacit knowledge, which is closely related to learning, is ignored. A large number of studies in learning science show that the best way for adults to learn is not to practice alone, but to learn in situations. Effective learning is to enter relevant situations and find one's own "learning community". At the beginning, learners turn around important members and do some peripheral work. With the growth of skills, they enter the core of the learning community circle, gradually do more important work and eventually become experts.Let's take a look at the original code: a Visitor class that holds the objects to be accessed.We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.Link: https://pan.baidu.com/s/1gggerkv Password: v2l6油坊营子乡征了五十亩好地作开发区，副乡长黄德强和老赵开始了一场明争暗斗，不想郝运来却被推上代理乡长。 当年在油坊营子插队的梁玉芬帮地重游，与郝运来相逢，两人旧情难断，在郝运来的建议下，梁玉芬欲投资“古井”矿泉水厂，郝妻刘翟平很为恼火，夫妻之间的关系很紧张，裂痕愈发加大。