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The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:辛刚心念一动，安桐这么说，显然是把自己看做心腹。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.时空。Strength Lift Belt: