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Deliberate practice is completely different. It has the following four characteristics:哄闹声中，方才将刚才的话题岔开，重新回到打猎这个话上来。Qu Goblin described Fan Shengmei and Qu Lianjie, one loving money and the other lecherous. Qu Lianjie gave her a gift card and asked Fan Shengmei to accompany her customers to drink. Everyone knows that you can't be a male and female friend, right? You hate drinking with old men. No problem. You change the appropriate way, but her way is to offend Qu Lianjie's clients.Columnist Li Gang once told an interesting story: A few years ago, his wife wanted to buy a school district house. As soon as he counted his savings, he did not even have enough down payment. Therefore, it is suggested that we should save some money. Of course, in the end, the arm failed to twist the thigh, and the wife borrowed it from east to west, forcing the down payment to be paid.B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).钱明见他吃亏，分外高兴。Fire doors and