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The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:这是一个关于沙滩少男少女的蓝色青春故事。生长在奇葩家庭的所谓“坏孩子”王恕拥有着强大的正义感，可他在学校还是被称为坏孩子。王恕偏偏喜欢上当之无愧的“好孩子”马秀，懵懵懂懂又哭笑不得的青春爱情发生着。Today, the branch of "Artificial Intelligence Cyber Physical Operating System" (new generation technology + commercial operating system "AI-CPS OS": cloud computing + big data + Internet of Things + block chain + artificial intelligence) is used. Enterprise leaders must understand how to fully infiltrate "technology" into "commercial" scenes such as the whole company and products, and use AI-CPS OS to form digital + intelligent forces to realize the re-layout of the industry, the re-construction of the enterprise and the self-renewal.1. Right-click "My Computer" > > "Properties" on the desktop and click "Advanced System Settings" on the pop-up page.大学历史系研究生沐天亮与林如亦为了写毕业论文一起上武当山考察，不想却陷入以庞天龙为首的盗墓集团设下的陷阱中，意在用其家传宝玉打开武当山上明朝建文帝宝藏之大门。Shutter time: The smaller the shutter time, the faster the photo will be taken. However, due to the fast photo taking speed, the light may not be enough and the picture will appear very dark. 1, 2, 3 That means that the shutter time is 1 second, 2 seconds, 3 seconds, and the photographing time is getting slower and slower, which will make the light of the photo increase sharply, or even explode too much. In fact, long exposure means that the larger the shutter time, the better. It is suitable for photographing night scenes. Remember to use a tripod.