Among William Empson's seven ambiguities, the theory of "ambiguity" is:
(1) One thing is similar to another, but they are similar in several different properties; (2) Various meanings caused by context coexist, including polysemy of words and polysemy caused by poor grammar; (3) Two apparently unrelated meanings appear at the same time; (4) Two or more meanings of a sentence are contradictory, reflecting the author's complex comprehensive mentality; (5) Looking for the true meaning while writing, resulting in inconsistent meanings of a word; (6) the statement is contradictory or cumbersome, forcing the reader to explain himself; (7) The two meanings of a word and the two values of a vague language are exactly the opposite meanings stipulated by the context.