许多历史学家认为梅森-迪克森线是美国南北分裂的象征。

Many historians view the ___Mason-Dixon line as a symbol of America's North-South divide.

在教育理念上，这个国家的南北差异就像一道新的梅森-迪克森分界线。

The difference in educational philosophies between the north and south of this country acts like a new ___Mason-Dixon line.