instruction system

详细解释:【计】 指令系统

例句：

Programming languages are divided into three types: machine language, which is also called an instruction system, is the only one used directly by computers.程序设计语言分为机器语言、汇编语言和高级语言三类。机器语言是计算机唯一能直接使用的语言，也叫做计算机指令系统；