C++的难点在于高级功能是在复杂，而且在学习的过程中，一旦高级功能混杂在一起，就很容易使人头晕，而本书则采用了子集的做法，在描述高级功能时，避免了功能间的相互影响，大大减轻了学习的难度。-C++ The difficulty lies in the complexity of advanced features, but also in the learning process, once mixed with advanced features, can easily cause dizzin