I also present a useful feature for variable-length argument lists, the gather and scatter operators.
此外还有一个非常有用的功能：可变长度的列表，聚集和分散运算符。
Length of a string variable: Input argument for the SUBSTR function, which determines the desired length of the resulting string or output of the length function.
字符串变量的长度：substr函数的输入参数，决定了结果字符串的期望长度或length函数的输出。
Note here that the argc variable (argument count) is implicit, because the length of the argv list is known.
请注意这里的argc变量(参数数量)是隐式的，因为argv列表的长度已经知道。
Forth argument stands for the length of the variable and the fifth one specifies the value of the parameter.
笼四上参数代表变量的长度，第5个指明参数的值。
Forth argument stands for the length of the variable and the fifth one specifies the value of the parameter.
笼四上参数代表变量的长度，第5个指明参数的值。
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