翻译；subroutine
this is a section of a program written to carryout a specific task which the main program may use just once or sereval times during its run.the last instruction of a subroutine usnally retnrns the computer to the instruction following the one from which it left the main program. large computer systems have a set of subroutines on disk or tape which can be "called"and used by the current program as and when required .A"proledure"is a form of subroutine in that the programmer can use it once or several times during a program. the main difference is that it is 'called' by name and must be defined(written) outside the main body of the program.It can also have its own variables
子例程
子例程是一个程序的一部分，用于执行主程序运行时可能一次式多次用到的特定工作。子例程的最后一条指令通常使计算机返回到它离开主程序处的下一条指令。大型计算机系统中的磁盘和磁带上有一些子例程，它们在当前程序需要时可以被调用，一个“子程序”是子例程的一种形式，程序员在一个程序中可一次或多次使用它。主要区别是它通过名字调用并且必须在程序主体之外定义(或写出)它还可以有自己的“参数”。