However, elements of type string do not appear as mandatory in the form because the schema accepts an empty value as valid input for a string.
但是，由于模式接受空值作为字符串的有效输入，因此，在表单中字符串类型的元素并不显示为必填的。
Please enter a valid input tray number for the banner page.
请输入有效的分隔页进纸盒编号。
Functional testing tests whether the output is the expected result with the valid input.
功能测试检验的是用有效的输入是否能够得到所期望的输出。
A positive test is when you put in a valid input and expect some action to be completed in accordance with the specification.
正向测试是指，当你输入一个有效的输入并且期望软件能够完成一些根据说明书规定的行为。
The editable character positions will either be occupied by the prompt character copied from the mask if they are unassigned, or with a valid input character if they have been assigned an input.
如果可编辑的字符未赋值，在其位置上将显示从掩码中复制的提示字符；如果它们已被赋予一个输入值，在其位置上将出现有效的输入字符。
The editable character positions will either be occupied by the prompt character copied from the mask if they are unassigned, or with a valid input character if they have been assigned an input.
如果可编辑的字符未赋值，在其位置上将显示从掩码中复制的提示字符；如果它们已被赋予一个输入值，在其位置上将出现有效的输入字符。
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