• 1. single quotation mark: 单引号 | 单引号〔即
• 2. RIGHT SINGLE QUOTATION MARK: 右单引号标记
• 3. SINGLE LEFT-POINTING ANGLE QUOTATION MARK: 左单角引号

• 1.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。
  dict.yoduao.com
• 2.The single quotation mark ('), however, does not provide this functionality.
  但是，单引号(')不提供此功能。
  dict.yoduao.com
• 3.If you start a string with a single quotation mark, you must end with a single quotation mark, and vice versa.
  如果字符串是以单引号开始，那么必须以单引号结束，反之亦然。
  dict.yoduao.com

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