“丈”在古代是一个长度单位,周朝时,计量长度是以手掌撑开时,拇指与中指间的距离为一尺,一尺等于六寸,一丈等于十尺。当时的婚姻制度不像现在一夫一妻制,而是尚有原始社会婚姻制度的遗存,即“抢婚”、“掠夺婚”、“野合”、“走访婚”、“对偶婚” In ancient times, the “Zhang” was a unit of length. In the Zhou Dynasty, when measuring the length of a palm, the distance between the thumb and the middle finger was one foot. One foot was equal to six inches and the other ten feet was equal to ten feet. At that time, the marriage system at the time was not like monogamy at the time, but there were still the remains of the marriage system of the primitive society, namely, “grabbing marriage”, “looting”, “wild”, “visiting marriage” , “Double marriage”