single quote mark的意思|示意

To create an actual apostrophe, put two single quote marks side-by-side (') to produce one quote mark in your output.

要创建实际的省略号，将两个单引号并排放在一起()，从而在输出中生成一个引号。

To create an actual apostrophe, put two single quote marks side-by-side (") to produce one quote mark in your output."

要创建实际的省略号，将两个单引号并排放在一起()，从而在输出中生成一个引号。

If the single quotation mark is the outermost quote, no variables are expanded.

如果最外边的引号是单引号，那么不展开变量。