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Create a new directory named "lib" and add the necessary jar package to import the project.CW频道剧集#The Outpost#第二季将于7月11日首播！兔子野鸡那更是遭殃，林子里养的兔子都被他们练习飞镖和射箭宰杀，倒省了雇工不少力气。Publish-subscribe mode is also called observer mode. It defines a one-to-many relationship between objects, allowing multiple observer objects to monitor a topic object at the same time. When an object changes, all objects that depend on it will be notified.《与神的约定》讲述为了救活垂死的孩子做出超越世界伦理道德的选择的两对夫妇的人情爱情电视剧。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.