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There is no conflict between the network firewall and the host firewall. It can be understood that the network firewall is mainly outside (collective) and the host firewall is mainly inside (individual).The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.周青一惊。For example, if you use Word to make a test paper, a test paper is usually divided into two or three columns, and the page number should be displayed under each column.3. When pressing the power button (turning off the screen display).为此刘邦和张良一直都忧心忡忡，在无法确定之前，一直派出大量的警戒暗中防备着。