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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.家境平平、工作出色、气质出众的林菲与相爱多年却一无所有的男友刘洋结束爱情长跑，决定“裸婚”，结果却遭到了林母的强烈反对拼死也要阻碍。Computer closed!中国首部描述小人物保家卫国的另类抗战大戏，以市井小人物的抗日传奇故事为主线，辅以共产党、国民党、汉奸、山匪与日寇之间的矛盾和智斗，男一号小沈阳以黑色幽默的手法，全方位多视角地展现了中国人不屈不挠的抗日精神。他顿时魂飞天外，不要命地扑过去用剑格挡。Mediator mode is easy to apply in the system and is also easy to misuse in the system. When there are complex object groups with 'many-to-many' interaction in the system, don't rush to use Mediator mode.