Definition
Working diligently and with great effort.
努力工作
Even though it was almost midnight, the students were still hard at it, studying.
雖然已經快到午夜了，學生們仍然在努力地學習。
The team is hard at it, trying to meet the deadline.
團隊正在努力地工作，試圖在截止日期前完成任務。
She's hard at it practicing the piano every day, hoping to win the competition.
她每天都在努力練習鋼琴，希望能贏得比賽。