If the double quotation mark is the outermost quote, all variables are expanded.
如果最外边的引号是双引号，那么展开所有变量。
A double quotation mark (") is missing at the end of the string being echo-ed.
echo后面的字符串的末尾缺少一个双引号（"）。
Use of double quotation mark delimiters on Linux and UNIX-based systems is recommended.
建议在基于Linux和UNIX的系统中使用双引号分隔符。
This explains why an unmatched single or double quotation mark causes a new prompt to appear.
这解释了不匹配的单引号或双引号会导致出现新提示符的原因。
Backslashes are interpreted literally, unless they immediately precede a double quotation mark.
反斜杠会被解释成单个字符，除非后面紧接着一个双引号。
Backslashes are interpreted literally, unless they immediately precede a double quotation mark.
反斜杠会被解释成单个字符，除非后面紧接着一个双引号。
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