string input and output 风格字符串的输入和输出
In this case, it is important not to apply the filter to the original input string, but only to the output version.
在这种情况下，重要的是不向原始的输入字符串应用过滤，而只向输出版本应用过滤。
Create an interface, which takes as input the business object, and as output a type of string.
创建一个接口，将业务对象作为输入，将字符串类型作为输出。
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。
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