3.In PL/1,the range indicated by the bounds of an array dimension,the range indicated by the length of a string, or the range indicated by the size of an area.

• 在PL/1语言中,由数组的维界所指定的一个范围,或者是由一个字符串的长度所指定的范围,或是由一个区域的大小所指定的范围。