长期以来 chángqīyǐlái for a long time
怎么记住“长期以来”: 长 long + 期 a period of time + 以 to use + 来 come = for a long time.
汉字
用法
- 'For a long time (up to now), over a long period' - a set adverbial phrase - 长期以来，这个问题没有解决 (chángqī yǐlái, zhège wèntí méiyǒu jiějué) for a long time this problem has gone unsolved.
- Sits at the front of a sentence, formal/written; frames a persistent, ongoing state.
- Compare 一直 (yìzhí, all along); 长期以来 is heavier and more formal, spanning a long historical stretch.