In fact, there are many factors, such as topic, writing background, writing commonplace, document style and writing habits of writers etc. , to influence class characteristics.

• 实际上,人们在写作过程中会受到多方面因素影响,如所要描写的主题、相关背景、写作常识、文章风格、写作习惯、词汇上下文语境等等,即一个类的分布特征是受到多因素影响的。