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Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.Generally, when shooting night scenes, there is no tripod. To ensure that the photos are not burnt, the high-speed shutter must be locked, which will lead to insufficient light and dark images. At this time, raising the sensitivity can brighten the picture. You can test it. Of course, this will sacrifice the picture quality.连番的四面作战，若只有八千人哪里能做到？城墙损毁的十分严重，在这样下去，破城是迟早的事，若是被人包围了就大大的不妙了。The First World War was a human catastrophe at the beginning of the 20th century. The war caused unprecedented disasters to the people of all countries. The warring parties mobilized a total of 73.4 million troops, more than 29 million troops directly involved in the war, about 10 million people died in the battlefield, about 20 million people were injured, more than 1.3 billion people were affected by the war, accounting for 75% of the world's total population at that time, and the economic losses caused by the war amounted to 270 billion US dollars.? There have been three industrial revolutions in human history. The industrial revolution has greatly promoted the development of productive forces, brought earth-shaking changes to people's lives, and also changed the original layout of the world's industry. The countries leading the industrial revolution have become the dominant powers in the world. The first industrial revolution made Britain's empire never set. The east wind of the second industrial revolution made the United States and Germany dominate the world. The third industrial revolution maintained the global hegemony of the United States.Song Guochun has been pleading, 'Liu Ge, you let me go. We don't have much enmity either. I can't talk nonsense when I go back.' Song Guochun stood six or seven meters from the stern. It took me almost five minutes to push him to a place without railings.大予言 吉田栄作 松本伊代