穷年累月

Explanation: Poor years: the beginning to the end of the year; after year: for several months. Described one after another, lasted long. 　　Usage: Joint type; as predicate, attributive; for a long time 　　Source: Qin Xun Kuang "Xunzi honor": "But the poor in lifetimes, I do not know enough, is touched the people." 　　Examples: It is sitting in his den, the check group membership, turning books like ~, this finalized, however there are still "not long", there is an error. (Lu Xun's "Lace literature exam three ugly") Thesaurus:  many a little makes a mickle, Many a little makes a mickle., Put the years, Tired old plot on, accumulate over a long period, With the passing of time In Deep, Poor years, generation after generation, a thousand-li journey begins with the first step--the highest eminence is to be gained step by step Antonym Group:  at a brush triumph, read ten lines at a glance, conspectus to have learned a passage so well as to be able to recite it, Achieved overnight to, expect results overnight; accomplish sth. in one move, under no consideration, Five elements Under all, Five elements And under, be quick at reading, easy as my eye, have a camera eye, be able to recite sth. after reading it over once, Bing Xie Ying edge, problems can be readily solved as a bamboo is split all the way down once it has been chopped open