extra wordspacing before and after punctuation marks. The conventions are: One space follows sentence-ending punctuation mark (period, question mark, or
with three handles. Everson, Michael. L2/09-425: Proposal to encode six punctuation characters in the UCS (PDF). 2009-12-05 [2018-03-24]. (原始内容存档 (PDF)于2016-04-07)
与File:Library of Ashurbanipal synonym list tablet.jpg CJK symbols and Punctuation (PDF). [2013-05-20]. (原始内容存档 (PDF)于2018-05-23). Unicode Standard Annex
Truss, Lynne. Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation North American. Toronto: Gotham Books. 2003. ISBN 1592400876. . 查看维基词典中的词条「apostrophe」。