knuckle down to work 认真开始工作
knuckle down to study 专心学习
knuckle down and focus 专注投入
decide to knuckle down 决心努力
finally knuckle down 终于认真起来
knuckle down hard 努力投入
1. You need to knuckle down if you want to pass the exam.
如果你想通过考试，就必须认真学习。
2. After a long break, she finally knuckled down to her studies.
长时间休息后，她终于开始认真学习。
3. It's time to knuckle down and finish the project.
是时候专心完成这个项目了。
4. He knuckled down and worked hard to improve his grades.
他努力投入学习以提高成绩。
A: We don’t have much time before the deadline.
A：离截止日期没多少时间了。
B: Then we need to knuckle down and finish everything.
B：那我们得认真投入把所有事情完成。
1) 指开始认真努力做某事
2) 指停止分心并专注任务
3) 指在压力下集中精力工作或学习
4) 表示下定决心投入行动
1. 认真开始做；专心投入
e.g.You must knuckle down if you want to succeed.
如果你想成功，就必须认真努力。
2. 集中精力工作或学习
e.g.He knuckled down and finished the assignment on time.
他专心完成作业并按时交了。
verb phrase
1. To start working or studying seriously and with determination, especially after a period of delay or distraction.
Synonym: buckle down, apply oneself