说明：  BREW的初级知识，分三章，第一章预备知识，第二章各种接口的使用，第三章杂项，主要是一些C标准库库函数的介绍
(BREW primary knowledge, divided into three chapters, the first chapter prior knowledge, the second chapter the use of various interfaces, the third chapter of miscellaneous items, mainly the standard C library function library introduction)