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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