Identify
　　用法：① If you can identify someone or something, you are able to recognize them or distinguish them from others.
　　例句：At the other extreme, the most #plex of the fire ants’ signals is probably colony odor, by which the workers of a particular colony or nest identify another worker as local or foreign. (2002.05)
　　② If you identify someone or something, you name them or say who or what they are.
　　③If you identify something, you discover or notice its existence.
　　④ If a particular thing identifies someone or something, it makes them easy to recognize, by making them different in some way.
　　⑤If you identify with someone or something, you feel that you understand them or their feelings and ideas.
　　⑥If you identify one person or thing with another, you think that they are closely associated or involved in some way.
　　
　　Illuminate
　　用法：①To illuminate something means to shine light on it and to make it brighter and more visible. (FORMAL)
　　②If you illuminate something that is unclear or difficult to understand, you make it clearer by explaining it carefully or giving information about it. (FORMAL)
　　例句：They use games and drawings to illuminate their subject.
　　
　　Illustrate
　　用法：①If you say that something illustrates a situation that you are drawing attention to, you mean that it shows that the situation exists.
　　②If you use an example, story, or diagram to illustrate a point, you use it show that what you are saying is true or to make your meaning clearer.
　　③ If you illustrate a book, you put pictures, photographs or diagrams into it.
　　例句：Printmaking derives from two historical sources: early woodblocks into which an image was cut and used to illustrate a book or playing cards, and the medieval practice of decorating metal with incised designs, as in armor. (2004.08)
　　
　　Imperative
　　用法：① If it is imperative that something is done, that thing is extremely important and must be done. (FORMAL)
　　例句：With the gradual evolution of society, simple counting became imperative. (1997.12)
　　② An imperative is something that is extremely important and must be done. (FORMAL
　　③ In grammar, a clause that is in the imperative, or in the imperative mood, contains the base form of a verb and usually has no subject. xue.netples are `Go away’ and `Please be careful’. Clauses of this kind are typically used to tell someone to do something.
　　④An imperative is a verb in the base form that is used, usually without a subject, in an imperative clause.