成语,是在长期的语言实践中形成的一种固定词组,有的来自古代寓言,有的来自历史故事,有的来自前人作品,也有的来自群众口语。一经形成,就不容任意改动。在长期使用过程中,积非成是的情况是有的,如“莫名其妙”又作“莫明其妙”,“故步自封”又作“固步自封”,“每下愈况”现在多作“每况愈下”之类。但解释起来,意思并不完全相同。为了表达的特殊需要,有意改动成语的情况也是有的,如毛泽东 Idioms are fixed phrases formed in long-term language practice. Some come from ancient allegories, some from historical stories, others from previous works, and others from the masses. Once formed, it can not be arbitrarily changed. In the course of long-term use, there are some things that can not be said to be true, such as “inexplicable” and “inexplicable”, “complacent” and “stubborn” such as. But to explain, the meaning is not exactly the same. In order to express the special needs, intentional changes in idioms are also some, such as Mao Zedong