我建议至少是数字,小写字母和大写字母的混合。
I recommend at LEAST a mixture of Numbers, lowercase letters, and uppercase letters.
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.
有效的名称只能包含小写字母、数字、点号、下划线和连字符。
A valid name can contain only lowercase letters, Numbers, periods, underscores, and dashes.
And s is this lowercase notation l that the spectroscopists use in place of the l number.
而s这个小写字母,被光谱学家用来代替数字。
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