Incorporate quotations of three lines or less into the text, within single quotation marks.
文本中三行或更少的合并的引用语，用单引号。
Within in the string, you can use as many single and double quotation marks as you like (see Listing 4).
在该字符串中，您可以使用任意多的单引号和双引号(参见清单4)。
Do not use quotation marks, except for single quotation marks round quotations within quotations.
除了引用之中再引用的单引号外，不用引号。
Do not use quotation marks, except for single quotation marks round quotations within quotations.
除了引用之中再引用的单引号外，不用引号。
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