The extra single quotes are escape characters.
“额外” 的那个单引号是换码符。
The use of the two single quotes is discussed in the next section.
下一节讨论为什么要使用两个单引号。
To ignore a signal, use two single quotes in place of the command_list
要忽略某个信号，使用两个单引号代替 command_list
Atoms must start with a lower case character, or you can delimit with single quotes.
原子值必须以小写字母开头，否则需要加上单引号。
Single quotes are better, because then you can use double quotes inside the one-liner.
单引号更好，因为使用单引号后您可以在一行程序内使用双引号。
Jython string can use either single or double quotes.
Jython字符串可以使用单引号，也可以使用双引号。
Listing 2. Single vs. double quotes.
清单2.单引号vs。
Shells make everything between quotes a single argument.
Shell使引号之间的所有内容都成为一个参数。
You can use either single or double quotes.
你可以用单引号或者双引号。
You can use either single or double quotes.
你可以用单引号或者双引号。
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