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A2. 1.7 Neck examination.可怜的小苞谷，还不知道自己已经成为大靖户部年纪最小的债务人。我们进去，你慢慢和我细说。Compared with abstract words, symbols, etc., the human brain is more sensitive to images and more impressive. In addition, the image is also more intuitive, the same thing, may sometimes take a long time to understand the text description, and look at the image will be clear at a glance.Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.So I shook him up and asked him to help change the diaper for the child.