Some Web sites require passwords with numbers and letters, others require numbers, letters and special characters, and still others require a capital letter, a lower-case letter and then a number.

一些网站的密码由数字和字母组成，另一些必须是数字、字母和特殊符号的组合，还有一些必须有一个大写字母，小写字母和数字组成。

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Most variables and functions should start with a lower case letter.

大多数变量和函数应以小写字母开头。

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Class names and constants in module scope should be capitalized, while method names and variables should start with a lower case letter.

类名和模块中的常量的第一个字母应该大写，而方法名和变量应该开始用小写字母。

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