work at something phrasal verbphr v to try hard to improve something or achieve something 努力改善,致力于 Learning a language isn’t easy. You have to work at it. 学语言不容易,必须很努力。
work at doing something couples who want to work at improving their relationship 想努力改善关系的夫妻
→ work at something at work1(PHRASAL VERB)