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bend ones knee to 向跪下，屈服于 drop to ones knees 跪下 fall on ones knees 跪下 knock down 撞倒;击落;拆除 knock off 把敲掉;击倒;停工 knock out 敲空;击倒 know about 了解，知道的情况 know better than 很懂得 be known as 以知名;被认为是 be known for 因而众所周知 be known to 为所知 be keen about 喜爱，对着迷 be keen on 喜爱;渴望 keep away 站开;使离开 keep back 留在后面;阻止;隐瞒 keep company with 和交往 keep down 控制;压服;缩减开支 keep from 阻止;使免于;隐瞒 keep in mind 记住 keep off 避开;不让接近 keep on 继续进行，反复地做 keep out of 躲开，置身之外 keep to 坚持;固守 | 
