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Ordinary exercises, also known as "naive exercises", are basically just doing something over and over again, and expect to improve performance and level only by that kind of repetition.待刘氏等人跟着板栗进来，便看见青莲缩在姑姑怀里不抬头，害得她想起身迎客也不能。小说和电视剧一起连载。The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.(2) "One Pair of Remaining" (OvR)P3D environment: FTX Global/VECTOR, Terraflora, REX4TDE, REXSF, REX WWA, PTA, ASP4, ChasePlane