计算机只能直接执行用机器语言编写的程序，但是机器语言对计算机依赖性强、直观性差、编写程序工作量大、程序结构也欠清晰。因此人们多数都是用接近自然语言的高级程序设计语言来编写程序，但计算机不能直接接受和执行用高级语言编写的这些程序，需要通过一个翻译程序将它翻译成等价的机器语言程序才能执行。

-Computer can only directly execute machine language program, but the machine language of computer-dependent, and intuitive poor programming workload, and program structure is also unclear. Most people are so close to natural language with high-level programming language to write procedures, but the computer can not directly accept and implement the preparation of high-level language to use these procedures, through a translation program will translate it into equivalent machine language program can be implemented .