《吕氏春秋·论·士容论》
薄疑回答说： 假如能象乌获那样力举千钧，那么又何况一呢？ 
薄疑对曰： 乌获举千钧，又况一斤？ 
Bo Yi replied, "If one could lift a thousand pounds as effortlessly as [the hero] Wu Huo, then how much effort would it take to lift a single one?"