In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.
首先是张家的佃户雇工，飞奔向山外，要去告诉郑家，沿途又不住地告诉人，那些在田间劳作的庄稼汉和家中忙碌的媳妇婆子、学堂里读书的娃儿，都纷纷赶到村路旁等着。
《医院革命》讲述历史悠久﹑公立的New Amsterdam医院来了位新的医疗主任Max Goodwin（Ryan Eggold饰），只要他有决心就不容旁人拒绝的他重新改写医院的内部，为这间人手﹑资金﹑重视度皆不足的医院注入新活力及回复昔日荣誉……毕竟这可是接收上至总统下至囚犯，亦是仅有能治疗埃博拉病毒的医院。
于是哈金斯组织了一群非常有篮球天分的黑人学生作为西德州联队的核心，开始了他艰苦的光荣之路。这些黑人球员连真正的篮球与街球的区别都不知道，而且他们对种族问题极度敏感，可是这些内部问题与外部的大环境相比根本算不得什么，整个学校的人从上到下都认为哈金斯疯了。
This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,
花生从小跟玉米好，也看我不顺眼。
世纪之初，以生物科技和大型连锁超市在台湾高雄撑起一方天下的瑞林公司，通过高科技项目在台上市，成为商界的焦点。瑞林公司董事长林再天(王识贤饰)，偕同好友沈浩南(温兆伦饰)共同管理瑞林，二人和小关(魏斌饰)三人情同手足。一次，浩南云南公干，误入丁昆(侯天来饰)设计的圈套，被迫出卖公司利益以求自保，瑞林公司因此遭受重大打击，濒临倒闭。林再天肩负兄弟情义和公司危亡来到云南，极力挽救瑞林集团，却也于事无补，瑞林公司最终倒闭。
在这婆子面前，就得用狼嚎。
Some common actions are listed here, and later articles will give detailed examples and summaries of them:
处于前线的犯罪集团在垃圾处理厂的掩护下从贩毒、赌场、谋杀等各种生意里赚取了丰厚的利益，但是黑帮内部的运作却并不顺畅。克拉多-瑟普拉诺虽然很喜欢托尼这个侄子 ，不过他不甘心在集团里反而位居晚辈之后，他利用托尼强悍的寡母丽维亚-瑟普拉诺来达到自己的目的。被托尼抚养长大的克里斯托弗-摩尔提萨蒂对他忠心耿耿，甚至不惜为托尼挡住子弹，可是年轻的克里斯托弗生性冲动，不但经常惹毛同伙，还给整个黑帮引来了不少麻烦。而且联邦调查局也不会轻易放过能击破托尼黑帮的任何漏洞。
前面声音轰然杂乱，附近却没有人声和动静，便悄悄地浮出水面四下打量。
令我震惊的话
Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:
《名门媳妇》是热播剧《名门新娘》的姐妹篇，讲述岭南世家民国时期大家族恩怨情仇的情感大戏。故事的主题以名门世家与平民之间的儿女情感为主线，演绎出错综复杂的情感纠葛，剧中充斥着阴谋与爱情，仁义与奸诈，忠贞与背叛……精心设计的故事情节，引人入胜。
Lost, open the sidebar, check!
The specific implementation is as follows:
某天他被卷入村子之间的争执，在他陷入烦恼的时候，
