每一参考照片用特定的字母和数字标识。
Each reference photograph is identified with the proper number and letter designation.
名称可以包括字母和数字，不能使用特俗字符。
The name can include letters and Numbers only - no special characters.
安全代码必须是仅由字母和数字构成的四位字符。
Security code must be exactly 4 characters - letters and Numbers only.
有的国家以特定的模式排列字母和数字，而另外一些国家则采用更自由的格式。
Some arrange letters and Numbers in a particular pattern; others are more free-form.
通常是大写字母、小写字母、特殊字符和数字。
Usually this is upper case, lower case, special character and a number.
通常是大写字母、小写字母、特殊字符和数字。
Usually this is upper case, lower case, special character and a number.
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