说明：   所谓核心函数，是PB的常用的重要函数。随着PB从3.0到10.0的版本升级，这些函数始终保留，并且部分函数的功能得到了进一步的扩充。这些函数都是核心函数。通过对这些函数的深入掌握，不仅可以具备开发PB应用程序的基础，并且可以促进深刻立即PB编程的核心思想，为初学者打好PB核心知识架构，为以后自学PB奠定好基础。
(The so-called core function is an important function of PB common. With PB versions from 3.0 to 10.0 upgrade, these functions always retained, and some of functionality has been further expanded. These functions are the core functions. Through a deep understanding of these functions, not only with the development of PB-application basis, and can be programmed to promote deep core idea immediately PB, PB core knowledge for the beginner to lay the framework for future self-PB laid a good foundation.)