一种插入一些无意义字符的处理方法。例如，在一个字段、记录或固定长度数据块的不用部分插入空字符、零或空格。

The process of inserting meaningless characters, such as null characters, zeros, or spaces, into the unused portions of a field, record, or fixed- length block of data.

用来分隔或组织计算机程序元素或数据元素的字符或字符串。例如括号、空格符、算术运算符、if（如果）、“BEGIN＂等。

A string of one or more characters used to separate or organize elements of computer programs or data; for example, parentheses, blank character, arithmetic operator, if,"BEGIN".