单引号或双引号都可以包围字符串，这就允许引文中再包含引号或撇号。
Either single or double quotation marks can enclose strings, which permits quotes that contain quote marks or apostrophes.
字母字符串可以用撇号(单引号)或引号(双引号)括起来。
Alphabetic strings may be enclosed in apostrophes (single quotes) or quotation marks (double quotes).
字母字符串可以用撇号(单引号)或引号(双引号)括起来。
Alphabetic strings may be enclosed in apostrophes (single quotes) or quotation marks (double quotes).
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