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However, under the circumstances at that time, I thought these things had little effect, because after we knocked them out, we began to gather in more quantities and launched attacks on positions from all directions. Judging from the form of attacks, they were quite organized and definitely beyond the reach of ordinary wild animals.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.Software Firewall: Firewall that applies software processing logic to run on a common hardware platform with low performance and low cost.我们去看电影，上车吧。像板栗葫芦他们倒也罢了，到底大些，摆出一副较量的架势，互相说着挑衅的话3? Spoofing attack项梁朗声道：那好，今日这场大雾是天意，是上天在帮助我们，在给我们创造机会突围。