Method, field, and local variable names begin with a lowercase letter, as in read .
方法、字段和本地变量名以小写字母开头，如read 。
Four to seven lowercase and alphanumeric characters, beginning with a letter.
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.
四到七个小写字母和字母数字字符，以字母开头。
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