“额外” 的那个单引号是换码符。

The extra single quotes are escape characters.

我们在上面那个举例中对条件值使用了单引号.

Note that we have used single quotes around the conditional values in the examples.

既然我们要通过一个常量比较 select 参数，可用单引号 ('') 包含常量。

Since we just want to compare the select parameter against a constant, we wrap the constant in single quotes ('').

这个句子中的单引号是多余的。

The single quotation mark in this sentence is redundant.

请确保你在文章中正确使用单引号。

Please ensure you use single quotation mark correctly in your article.

英式英语中，单引号常用于直接引语。

In British English, single quotation mark is often used for direct speech.

在编程中，字符串通常用单引号括起来。

In programming, strings are often enclosed in single quotation mark.

你应该在句子中使用单引号来引用别人的话。

You should use single quotation mark in a sentence to quote someone.

引号有时被称作单引号.

A quotation mark is sometimes called an inverted comma.

在英国式的英语，单引号被用。

In British English, single quotation marks are used.