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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:陈启摇摇头，说道：你没觉得，电视剧的舞台太小，你的舞台应该更大一点。大苞谷见他想事，便起身在书房里四处转悠打量，一转就转进里间去了。会稽，震泽山庄这是个啥？凤海接过风铃问道。他姐姐葡萄白了他一眼，道：瞧把你显摆的。Second, operate the menu "Drawing", "Block" and "Definition Attribute", or directly run the command "attdef", enter "Elevation" in the "Mark" in the "Definition Attribute" window, enter "Elevation =" in the "Prompt", enter "00.00" in the "Default", use 3.5 for "Text Height", and press "OK" to close the window.