Abstract: The vocabularies of human language are limited, but the things in the objective world are limitless. So it is difficult for people to use the limited words to express the limitless things. Naturally, people will express the objective things by means of fuzziness. The theory of traditional rhetoric often overemphasizes the importance of clear and precise language. In fact, the phenomenon of fuzziness in the language can be found everywhere. It seems inevitable. Fuzziness is a basic feature of human language, and is also the normal phenomenon in the real world; hence, the languages that reflect the objective world are bound to bear the feature of fuzziness. Although fuzziness has no clear boundary, this phenomenon of language exists objectively in some degree, and there is no good or bad fuzziness. The fuzzy language doesn’t hinder the interpersonal communications. However, in daily speech communication, there are many times that we need to use the fuzzy language in a large number. The fuzzy language does no harm to the information interflow between people, but rather plays a positive role in communication, which just makes the natural language rich in more kinds of different expressions. In communications, fuzzy language can not only improve the accuracy, flexibility and simplicity of language but also make the expression implicit, euphemistic and polite. This article illustrates its importance through a great deal of applied examples. However, the fuzzy language is a double-edged sword, while demonstrating its peculiar function; when it is improperly used, its drawbacks are obvious.
Key words: fuzzy language; the expression of the language; positive and negative functions of the fuzzy language

摘要：人类语言的词语是有限的，而客观世界中所存在的事物是无限的。人们很难用有限的词汇来表达无限的事物，自然的，人们就借助于模糊语来表达模糊的客观事物。传统修辞学理论往往过分强调语言清晰和准确的重要性。事实上，语言中的模糊现象无所不在，不可能也没有必要对此加以回避。模糊性是人类语言的基本特征之一，也是现实世界的正常现象，作为客观反映世界的语言必然会有模糊性。尽管模糊语言没有确定的边界，但是它是一种客观存在的语言现象，所以模糊语言本身并无好坏之分。语言的模糊性并不会妨碍交际，在日常的言语交际中，往往需要大量的模糊语言。语言的模糊性不仅不会影响人与人的信息交流，词和句子的模糊性反而在交际中起了积极作用，使得自然语言更具有表现力。在日常交际中，模糊语言不仅能提高语言的准确性、灵活性和简便性，而且能使表达含蓄、委婉、礼貌。这篇论文通过大量的实用例子来说明模糊语言的重要性。但是，模糊语言又是一把双刃剑，在表现出它特有的功能的同时，如果使用不当，其弊端也是显然的。
关键词：模糊语言；表达；模糊语言的积极和消极功能