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.
Speed = physical strength * 0.1 + endurance * 0.1 + strength * 0.1 + agility * 0.7 + magic * 0 (magic does not accelerate)
长期宅居的废柴米虫，本来打算在河边结束自己一无是处的人生，却因为意外救了一个溺水的女孩知了而打断了计划。几天之后一场意外，更是让两人踏上了劫数横生的逃亡之路。一系列匪夷所思的遭遇把他们的命运纠缠在一起，与此同时，两颗边缘的心灵逐渐靠近，从各自灰色的青春困境中找到了久违的阳光和希望。
Tashi has been afraid to show his heart. But more than a month after Ma Jinyu left, the young man was thinking about the female reporter from Guangzhou every day. Finally, Tashi decided to call Ma Jinyu to express himself.
库珀（瓦耶特·鲁塞尔 Wyatt Russell 饰）是一位喜欢游历世界的青年，某次，旅费吃紧的他参加了一项游戏测试的工作，没想到这份收入优渥的工作却给他的人生带来了毁灭性的打击。
保罗逃脱了，但是在逃脱过程中瑞亚娜被困在了他的工业世界中。一个邪恶的“Spellbinder”也在同时发现了来到保罗世界的途径。保罗和瑞亚娜必须用他们的智慧和想象力来防止邪恶Spellbinder得到工业世界中的技术和力量。
本季中Clark将揭示更多关于其故乡星球的秘密，他的身生父母究竟是谁，他的未来旅途将会如何，以及他为什么被送到了地球。
The process of taking the teacher's qualification certificate is as follows:
如今历史似乎正在按照原本的轨迹发展，即便有一些小偏差，但是大体的方向并没有变化。
3. Code Encapsulation of Publish-Subscribe Mode
我跟你说，皇宫可不好玩，规矩大的很……絮絮叨叨说了许多，总之，是要乌龟们不可贪恋外面的荣华，外面危险的很，要一直呆在张家的地洞里。
更为可气的是，项羽死后，项伯似乎还投靠了汉朝，似乎还被赐姓为刘，不知他是何感受？再下来便是项梁麾下诸位将领，当先的身材高大，十分威猛，年纪不大却一脸络腮胡子。
心慌之下，他一把搂住林聪腰部
单身母亲潘娇娇（刘蓓饰）和三个孩子平凡却又艰难的生活随着两个男人的出现被彻底打乱，潘娇娇也迎来了一场轰轰烈烈的爱情。
On the contrary, the slower the shutter speed, the more blurred the moving object will be.
The second flash said, "My ship is turning left";
7岁的伯蒂尔的父母在工作，伯蒂尔独自在家，感到无聊。自从他妹妹玛莎因病去世以来，他是家里唯一的孩子。但当他…
Receiver receiver = new Receiver ();
From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:
