单词great-grandparent
n.: 外曾祖；曾祖母
网络: 曾祖父母；曾祖父或曾祖母
曾祖母,外曾祖母
曾祖,外曾祖
复数：great-grandparents
Over much of the globe, the living standard of, say, a farmer in 1750 would not differ greatly from that of his great-grandparent.
例如，在全世界大多数地区，一个农民在1750年的生活水平和他的曾祖辈没有太大区别。
Effect of Selection Method for Succession of Great Grandparent Silkworm on Maintenance of Characteristics
家蚕母种继代蛾区选择方法对种性维持的影响