暗示：使用大写字母和小写字母，数字，符号，如！
Hint: Use upper and lower case characters, Numbers and symbols like!
西文大写字母和小写字母均分别称作西文大写字盘和西文小写字盘。
Capitals and small letters are known as upper case and lower case respectively.
大多数变量和函数应以小写字母开头。
Most variables and functions should start with a lower case letter.
方法、字段和本地变量名以小写字母开头，如read 。
Method, field, and local variable names begin with a lowercase letter, as in read .
四到七个小写字母和字母数字字符，以字母开头。
Four to seven lowercase and alphanumeric characters, beginning with a letter.
真理和正义，谎言和压迫用小写字母。
真理和正义，谎言和压迫用小写字母。
应用推荐