knuckles down短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 na.开始认真工作；干劲十足地干 The rise in membership is thought to be caused by the boredom of being stuck at home in the snow as the UK knuckles down for its coldest winter in 30 years. 该网站会员人数激增一方面是因为很多人被大雪困在家中无事可做。今年英国遭遇了近30年来最寒冷的冬天。 bbs.lyd.com.cn