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Bridging mode aims to decouple abstraction and implementation so that the two can change independently. That is to say, the bridging mode further abstracts the implementation details of the original base class into an implemented structure, and then transforms the original base class into an abstract hierarchical structure, thus realizing independent changes of the system in multiple dimensions. The structure diagram of the bridging mode is shown below.The new BMW 3 Series has very well-equipped chassis protection, and the use of large-area protective plates prevents the oil pipeline from being directly exposed to the bottom of the vehicle. On the other hand, the lower part is equipped with a whole metal guard plate (for the convenience of chassis shooting, the guard plate has been removed and is not shown on the figure), which can provide strong protection for key parts such as engine oil pan. In addition, the guard plate can also comb the airflow passing through the chassis, thus improving the handling performance.Under the direction of new boss D.B. Russell, the team tackles cases involving a wild shootout on a Las Vegas tram car, and the death of a deer hunter.那时候，它等你过去，再把长好的皮毛送你。陈启挥挥手，就像是挥走一只苍蝇。What will China develop into after two more 15 years of struggle? The 19th National Congress of the Communist Party of China also gave a very specific description.A dozen means 12, and a dozen socks means 12 pairs.