开发MT4交易平台智能交易系统需使用MQL4语言，本书详细介绍了MQL4的使用方法，介绍了各类语法、函数。另外，不同于以前的版本，这个版本的内容进行了更新修订，修改了许多错误之处。特别是去掉了上一版中很多地方乱七八糟的=号，使内容更加简明清晰。(The development of MT4 trading platform intelligent transaction system requires the use of MQL4 language. This book introduces the use of MQL4 in detail, and introduces various kinds of grammar and functions. In addition, unlike previous versions, the content of this version has been updated and revised, and many errors have been corrected. In particular, it removed the mess number in many places in the previous edition, making the content more concise and clear.)