一种区域的基本单位，通常是一个字符的大小。
A basic unit of area, usually the size of a single character.
选择heading2；并应增加字符串的大小。
Select heading 2; the character string size should increase.
选择heading1；并应增加字符串的大小。
Select heading 1; the character string size should increase.
方法修改，但upcase方法只返回大小写修改后的字符串副本。
Method, but just the upcase method returns a copy of the string with case changed.
选择heading1，并增加字符串的大小。
Select heading 1, and the character string size should increase.
查询字符串键区分大小写吗？
输入图中的字符，不区分大小写，点击可以换一个。
Input the characters in the image. Click me to get a new one.
密码至少输入8位字符，区分大小写。
Your password must be at least 8 characters and is case sensitive.
密码至少输入8位字符，区分大小写。
Your password must be at least 8 characters and is case sensitive.
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