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。

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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。

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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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