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The division of the three worlds was not only the basis for formulating foreign policies at that time, but also an important guiding ideology that had an impact on China's diplomacy for many years to now.王尚书停止翻书的动作，抬头对儿子道：这孩子才三岁。你跟林火长去对付那个公主去吧。这屋子是我姑姑出嫁前住的，虽然长久不住人，但我都常进来打扫的，不比其他的屋子，都封上了。The three-way handshake is completed, the TCP client and the server successfully establish a connection, and the data transmission can begin.板栗则回京领旨统兵，急速往边关去截秦霖。If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.