The extra single quotes are escape characters.

“额外” 的那个单引号是换码符。

youdao

This saves some careful work with escape characters.

这可以减少处理转义字符的工作。

youdao

Note that various escape characters must be used such as \ "for double quotes."

主要必须使用各种转义字符，如双引号用\ “表示。”

youdao

So you have what are called escape characters like backslash N that is the shorthand notation of telling the computer put a new line character here.

幸亏我们有一些类似反斜杠n的转义字符,这只是一种简化方式,用来告知电脑要在这新添一行。

哈佛公开课 - 计算机科学课程节选

If you want to escape certain characters, you need to use these so-called escape sequences.

如果你想与其他字符隔开，你就要用到所谓的转义字符。

哈佛公开课 - 计算机科学课程节选

And then sometimes we'll see you need to escape even more useful characters.

有时我们需要你,用一些有实际意义的字符与其他字符隔开。

哈佛公开课 - 计算机科学课程节选

The quarry features in this novel in both senses of the word, as Mr Galgut's characters try on every page to escape their destiny on foot, in trucks or by train.

ECONOMIST: New fiction

With the sun stabbing at them through their window blinds, the two old men struggled to their feet and lurched out onto their adjacent verandas, emerging at almost the same moment, like characters in an ancient tale, trapped in fateful coincidences, unable to escape the consequences of chance.

NEWYORKER: In the South