of idioms is reflected in the illogical relationship between the literal meaning of each word and the meaning of the idiom.For instance, rain cats and dogs which is used in the sense of"rain heavily"literally makes nonsense.习语的语义统一体现在每个词的字面意义与习语意义之间的非逻辑关系上。例如，rain cats and dogs这个词的意思是“雨下得很大”，它的字面意思是毫无意义的。
