the Mason-Dixon Line

剑桥词典

the border between the states of Maryland and Pennsylvania in the US, traditionally considered to mark the division between the north and south of the US
梅森-狄克森线（美国马里兰州和宾夕法尼亚州之间的分界线，也是传统上认为的美国北方各州和南方各州的分界线） 返回 the Mason-Dixon Line