A specific segment of coding, which are used frequently throughout a program, that can be defined at the beginning and used and referenced by a mnemonic code with parameters. This increases coding efficiency and readability of the program.

• 一段专用代码,在某个程序内频繁地使用。它能在程序起始部分加以定义,并由带参数的助记码引用和参照,从而提高了代码的效率和程序的可读性。