10 Types of Speech
　　
　　Standard usage includes those words and expressions
　　understood, used, and accepted by a majority of the speakers of
　　a language in any situation regardless of the level of formality. As
　　such, these words and expressions are well defined and listed in

　　
　　go on

[此贴子已经被作者于2006-9-20 20:38:37编辑过]

Colloquial speech often passes into standard speech. Some slang
　　also passes into standard speech, but other slang expressions
　　enjoy momentary popularity followed by obscurity. In some cases,
　　the majority never accepts certain slang phrases but
　　nevertheless retains them in their collective memories. Every
　　generation seems to require its own set of words to describe
　　familiar objects and events. It has been pointed out by a number
　　of linguists that three cultural conditions are necessary for the
　　creation of a large body of slang expressions. First, the
　　introduction and acceptance of new objects and situations in the
　　society; second, a diverse population with a large number of
　　subgroups; third, association among the subgroups and the
　　majority population.
　　

同学.有没有book版的啊?

这样背对眼睛很不好的..

不错

就是长了

如果加上翻译就回更好