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2.4. 1 Dimension requirements for positioning holesLiu Spruce, an associate professor at Peking University, made statistics: In the 1980s, 30% of Peking University students came from poor families. In the 1990s, the proportion of poor families began to decline gradually. After 2000, the proportion of poor families was only over 10%.我们会解决顾客的任何“困扰”！《吸血鬼日记》由美国女作家L.J.史密斯的同名畅销系列小说改编而成。说着呵呵笑，告诉魏铁等人道，他小时候跟白虎侯来过一次。Bridging mode is to separate things from their concrete implementation so that they can change independently. The purpose of bridging is: Decoupling abstraction and implementation, So that the two can be changed independently, Like our commonly used JDBC bridge DriverManager, when JDBC connects databases, it switches between databases without moving too much code or even at all. The reason is that JDBC provides a unified interface, each database provides its own implementation, and a program called database driver is used to bridge. Let's look at the diagram: