缩略形式和缩写形式的区别：
缩略是指一部分省略不写。由一个词组中各主要词的一部分（通常是实词的第一个字母或第一个音节）复合而成. 比如
I’m =I am
we're=we are
you're= you are
he’s =he is
she’s =she is
it’s =it is
they’re= they are
What’s =what is
I’ve got =I have got
he’s got = he has got
let’s =let us
Isn’t =is not
aren’t=are not
don’t =do not
doesn’t=does not
didn’t =did not
can’t =can not
I’d like = I would like
Won’t = will not
shouldn’t = should not
There’s = there is
there’re = there are
There isn’t = there is not
there aren’t= there are not
that’s = that is
when’s=when is
who’s = who is
而缩写形式是指常用词的简便写法,缩写方式有：
a.截取词的第一个字母来代表这个词,如C代表Carbonium；
b.截取词的前几个字母,如Oct.代表October ；
c.分别截取词中两个词素的第一个字母,如Dr.代表Doctor.
比如
TV=Television
U.S.A.=abbr.美国(=United States of America);
U.K. 联合王国(=United Kingdom)
DIY (do it yourself) 指自己动手装电脑,缝制衣服,做贺卡
DVD (digital video disc) 数字激光视盘
EMS (express mail service) 邮政特快专递
EQ (emotional quotient) 情商
IQ (intelligence quotient) 智商
ICU (intensive-care unit) 重症病房
IP (internet protocol)
网际协议 IT (imformation technology) 信息技术
OA (office automation) 办公自动化
OEM (original equipment manufacturer)
原始设备制造商 PC (personal computer)
个人计算机 PT (particular transfer) 特别转让
SCI (science citation index)
科学引文索引 SOHO (small office home office) 小型家居办公室
SOS (Save Our Souls; radio signal once used universally to appeal for help esp. by a ship or boat; urgent request for help from sb. in trouble) 国际上曾通用的紧急呼救信号,也用于一般的求救或求助
ST (special treatment) 特别处理
VIP (very important person) 要人
VOD (video on demand) 视频点播
WWW (
World Wide Web)
万维网