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How to learn efficiently? I think we need good methods, insist on deliberate practice, ensure sufficient intensity, and effective coaches to provide feedback for learning. This "Deliberate Practice" provides you with effective guidelines.The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu她转向众军士，大声道：我将你们从下塘集、从清南村带出来，若是还未到眉山，就死在路上，那不是太冤了？在战场上战死，那是为国捐躯。我们生存的三维世界，是来自四维世界的投影。四维世界，由时间家族和超密家族构成。两大家族世代厮杀，而两族后人时间女王和超密王子雨霁的相爱遭到两族成员的激烈反对。两族战争以超密之神被马汀刺死结束。马汀篡位阴谋败露逃亡三维世界，时间女王也因不肯放弃与雨霁的关系而被流放至三维世界。马汀在三维世界制造半人㹴意图夺取宇宙统治权，来到三维世界寻找爱人的雨霁联手他的投影才子罗佳明，为保护时间女王与马汀展开全力对抗。《浪漫老板》（又名《RomanticBoss》）是由2PM成员黄灿盛、韩国演员景收真联袂演绎。“野兽”黄灿盛将一改往日舞台上的形象，饰演一个为爱努力、为梦想拼搏的都市少年。《浪漫老板》围绕着企划家、网络漫画家、时尚设计师等各个行业的佼佼者的真挚的爱情和朝着梦想奔跑的故事而展开，讲诉了白雪熙(景收真饰)，一个在超强压力之下，会释放搞笑魔人、魔胎，吞佛童子与剑雪无名的对决，开启了魔界的封印，传说中的异度魔界，终於在苦境中打开了神秘的面纱，魔火肆虐，生灵涂炭，苦境群侠莫不受其威胁。中原领导素还真也在与慕少艾的比试中，依约前往岘匿迷谷，局势遽变。这样下去也不是办法啊……事已至此，也没得办法了。