keep good men company and you shall be of the number.近朱者赤，近墨者黑。
kill two birds with one stone.一箭双雕。
kings go mad, and the people suffer for it. 君王发狂，百姓遭殃。
kings have long arms. 普天之下，莫非王土。
knowledge is power. 知识就是力量。
knowledge makes humble, ignorance makes proud.博学使人谦逊，无知使人骄傲。