keep back 阻止，阻挡;隐瞒，保留
keep down 控制，压制，镇压;压低，放低(声音)
keep from 使…不(做)
keep off 不接近，避开
keep on 继续不断，保持
keep out of 躲开，置身…之外
keep to 坚持，保持
keep up 保持，维持;继续进行，坚持
keep up with 向…看齐，跟上…
knock down 撞倒，击倒
knock out 击倒，击昏
known as 被认为是，被称为
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