From 1940 to the mid-1970s , the tendency for men to marry down educationally became more pronounced and the cultural ideal of hypergamy - that women must marry up - became more insistent .

从1940到1970年代中期，男人向下娶的趋势变得更加明显，而文化上的理想婚姻女人往上嫁变得更加坚定了。