韩国免费二级片

徐文长满面不解。今年冬天再开始征兵的话，又可以增加了几万军队。清南村因为出了四个进士，加上青山书院、青山医学院落户在此。The "Learning Culture" section is extremely rich in content and is divided into columns such as Chinese ancient books, Chinese literature, Chinese poetry, Chinese opera, Chinese music, Chinese fine arts, Chinese literature, Chinese architecture, Chinese martial arts, Chinese medicine, Chinese idioms, Chinese couplets, Chinese lantern riddles, Chinese characters, etc. Each column has a lot of content.上世纪八十年代中期，北京又迎来了一个寒冷的冬季。已过而立之年的作家方言（佟大为饰演）听说他儿时的伙伴高洋（果静林饰演）已经离开了人世，痛苦万分的他陷入了沉思，开始了对青春往事的追忆……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.Observer mode: pay attention to encapsulating object notification, support the change of communication object, realize the change of object state, notify and update the objects that depend on it.