1·Perhaps in the broader world, you might find years that have two or four digits and might even contain an apostrophe, as in '09.
可能在一个更广阔的世界,您可能发现拥有两位或四位数字的年份,甚至可能包含一个撇号,如'09。
2·The purdue online writing lab also explains how to use an apostrophe correctly in possessives and other cases.
普渡在线写作研究室也解释了如何在所有格及其它时态中如何正确使用撇号。
3·When do I need to use an apostrophe?
什么时候用撇号?