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4. One bar is Second Officer: the most elementary and inexperienced pilot in the cockpit; Responsible for shift work on long-distance flights; Only when the plane reaches the cruising altitude can it sit in the right driver's seat.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:该剧讲述主要讲述了2022年北京冬奥会来临之前，北京胡同一家人开展冰雪运动，共圆奥运梦想的励志故事。永平帝仿佛看见一只大乌龟划拉着四根漆黑麻乌的乌龟爪子。云海燕声音平淡，如同局外人一样，说出相关数据。钟雅兰十六七岁，容颜清秀。订阅高一点，月下的写作动力也会大一点。