FAQs About the word knuckle down (to)

專注於(某事)

埋頭苦幹,濃縮(於),墜落,專注於,定居(下來),地址,辦法,臉,插手,專注於

避免,規避,迴避,擺弄,空閒,滯後,混亂,猴子(周圍),玩,戳

knows => 知道, know-nothingisms => 不懂裝懂, knowledges => 知識, know-hows => 訣竅, knouts => 鞭子,