长期以来

chángqīyǐlái

HSK 7

长期以来 — chángqīyǐlái

1. for a long time; for a long period

   长期以来，他一直致力于环境保护。 chángqīyǐlái tā yìzhí zhìlìyú huánjìngbǎohù — For a long time, he has been devoted to environmental protection.