如果将页面设定为在文本框中输出该字符串，就能看到如图5所示的结果。
If you set the page to output the string in a text box, you can see the results shown in Figure 5.
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。
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.
终端用户可以从同德语言输入，查看，打印字符，和一个系统应该可以接受数据，然后进行处理，并正确输出结果。
The end user can input, view, and print characters from diverse languages, and a system should be able to accept data, process it, and output results correctly.
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