左单引号
Left single quotation mark
以上为机器翻译结果，长、整句建议使用 人工翻译 。
可以使用单引号或双引号，只要左引号和右引号匹配，常用的还有其它引号的变化形式。
You can use single or double quotes as long as opening and closing tokens match, and there are other variations on quoting that are frequently useful.
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