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十年前，发生了震撼世界的重大事件“第一次爱之夏”。3. The outer epidermis of the regular network cable also has certain ductility, also called elasticity. If the outer epidermis is inelastic, it is easy to break. Therefore, when buying the network cable, you can reduce a 0.5 meter long network cable and pull it to both sides. See if there is a crack in the middle or if the epidermis can extend to both ends. If there is no crack in the middle during the pulling process, and the epidermis can also extend to both ends, then the epidermis of this network cable meets the standard. In addition, we should pay attention to a problem. In the process of pulling, although some network cables have no cracks, there are obvious signs of whitening and thinning in the middle, which is also not in line with the standard.2. Color matching is easy to be dirty. It is recommended to use dark color.The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.　电影以来自山东的叔侄俩叶振云和叶川，结伴来到改革开放初期的“花花世界”广州，在火车上相遇了同乡女大学生刘芳为开头。在三人一次次的不期而遇中，上演了一段在理想和情感之间徘徊的青春修炼曲。然而就在此时，香港商人李想的出现，又将这段错综复杂的感情推向另一个高潮。