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　　新书店虽然明亮整洁，曼尼却还是想着回到布莱克书店。他希望伯纳能主动道歉，这样自己就能有台阶回来。无奈恶劣的伯纳就是不肯先低头，看不下去的弗兰只得出面担任他俩的调解人。但弗兰自己也有糟糕的生64-bit processor and operating system required秦王？立谁？赵高简短问了两个字。Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.Decorator mode is also called Wrapper mode, which can dynamically add some additional functions to an object. Decorator mode is more flexible than the way of inheriting and generating subclasses. Although decorator mode can dynamically attach responsibilities to objects, it will also cause some small objects to be generated, increasing the complexity of the system. The specific structure diagram is shown below.The whole sock body is treated with high elasticity, which ensures the compressibility of the product and makes the product fit more closely with the foot.