PHRASAL VERB (尤指前期不努力之后)开始努力工作(或学习) If someone knuckles down, they begin to work or study very hard, especially after a period when they have done very little work. (尤指前期不努力之后)开始努力工作(或学习) [informal]
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The only thing to do was knuckle down and get on with some serious hard work. [VERB PREP.]
唯一能做的就是开始努力工作,好好干出点儿成绩来。
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He managed to knuckle down to his lessons long enough to pass his examination. [VERB PREP. + to]
他在离考试还有足够长时间的时候就开始认真学习,从而通过了考试。
SYN apply yourself, try, study, concentrate
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