A string with no characters and length 0, represented by two quotation marks.
空字符串：没有字符的字符串，长度为0，用两个单引号表示。
An empty string contains no characters and has length 0, but other than that, it is the same as any other string.
空字符串不包含字符，长度为0，除此之外，都与其他字符串是一样的。
In some cases, no characters can be entered at the Virtual Keyboard in entry fields of web browsers or applications.
在某些情况下，浏览器或者应用程序的输入框下使用虚拟键盘可能无法输入字符。
No characters were used to record the language for a long period of time in Japanese history.
日本国在历史上很长一段时间内都没有文字来记录自己的语言。
No characters were used to record the language for a long period of time in Japanese history.
日本国在历史上很长一段时间内都没有文字来记录自己的语言。
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