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Practical purposes: College students' popular science activities in rural areas, go deep into the countryside to carry out investigation activities such as environmental sanitation status investigation, villagers' attitude investigation towards the new rural cooperative medical system, popular science knowledge investigation, etc., to publicize scientific planting knowledge and improve environmental protection awareness. At the same time, let college students really go out of the school gate, contact with the society, understand the national conditions, increase their knowledge and get exercise in practice, put the knowledge learned in the school into practice, increase social experience, so as to better participate in public health work in the future.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:《假面骑士剧场版：平成世代 FOREVER》是一部穿越时空的战斗，在常磐庄吾与桐生战兔的世界里发生了异变，就像被替换成别人一般、同伴们的记忆一个接一个地失去了。接着在他们面前，Super Time Jaker·Tid现身了，在守护少年幸吾的战斗中，庄吾遇见了一位喜欢假面骑士的青年·充（Ataru）。位于北角的七姊妹道，相信没有香港人是不认识 的，但七姊妹的得名由来，却是众说纷纭，有传 闻话在以前，海面上出现了七块大小一样的大石 头并列一起，所以就称为七姊妹，但亦有另一个 传言，在战前，有七位感情极佳的金兰姊妹，为 了一段情孽而一同跳海自杀，翌日，六具女尸手 挽手的浮上水面，自此七姊妹道闹鬼的传言就不 胫而走。而这段传闻亦在七姊妹道辗转流传了十 多年，直至一九四七年‧‧‧谢子堂本来是药油厂少 东，但十多年前一宗谣传，导致药油厂倒闭，堂 父母更因此先后身故，自此，堂就与妹妹谢美宁 及父亲生前忠仆陈通一家一齐生活，辗转十多 年，堂成为一个邮差，但他对派信工作十分尽忠 职守，令他得到一个死信活投的外号。现在鲁元的年纪虽然不大，还没有到婚龄，不过再次确认此事，订婚也是不错的。2. Integration and commonality of celebrity endorsements. As an enterprise's brand, there will be development, brand expansion and different spokesmen. Spokesmen should be selected from the long-term plan of brand building and pay attention to identity. The shaping and maintenance of brand image should consider the long-term nature of the overall brand image while considering the phased objectives of brand development.你们放弃了追随大名切腹的忠义，难道不想在这里重获荣誉么？黑须鬼倭侧头避开了徐海的目光：浪人，早已失去了荣誉。