from 连接的两个对象一般有本质的区别吧,fact-opinion,wrong-true,Republicans - Democrats,
mood swings ---genuine manic-depressive psychosis
between连接的两个对象属于同一大类中的两个不同小类,genuine diamonds-imitation diamonds, The Use of Unit Values to Discriminate between Price and Quality Competition, Lotterty Designs to Discriminate between Shackle's Theory. Expected Utility Theory and Non-expected Utility THeories