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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.As for why, look at the following development cases.15.1 Any naked eye with far vision lower than o.7 is not qualified.张无忌不可置信的看着周芷若，周芷若却不敢再多看张无忌一眼，掩面而走。Factory methods, abstract factories and builders all need an additional factory class to instantiate "an object", while Prototype clones "mutable objects" through prototypes (a special factory class).Zhou Yumin