缩写单词是否要加点People are often uncertain about whether or not to use full stops in abbreviations.
Here are some guidelines: 人们经常不确定到底什么时候要在缩写词后面加个点，什么时候不用。
下文是遥规则： 1.
In both British and American English, if you are using initial (i.
e.
first) letters to represent words, you don’t normally need to put a full stop after them: 在英国英语和美国英语中，如果缩写是从各单词的首字母得来的，通常无须加点，如： BBC(British Broadcasting Corporation英国广播公司) CNN(Cable News Network美国有线电视资讯网) UK(the United Kingdom联合遥国) NATO(the North Atlantic Treaty Organization北大西洋公约组织) IAEA(International Atomic Energy Agency遥原子能遥) 2.
In American English, however, it is common to use a full stop as an alternative style for certain abbreviations, in particular: 但是，在美国英语中，有些缩写可以加点也可以不加点，如： USA or U.
S.
A.
US or U.
S.
3.
If an abbreviation consists of the first and last letters of a word, you don’t need to use a full stop at the end: 如果缩写是由首字母和末尾字母组成的，则无须加点，如： Mr(Mister先生) Dr(Doctor医生) 4.
If the abbreviation consists only of the first part of a word, then you should put a full stop at the end: 如果缩写只是某个单词开头的几个字母组成，则需要加点，如： Wed.
(Wednesday周三) Dec.
(December十二月)