由于原始材料的缺乏和古代语言文字的障碍，学术界对古巴比伦时期土地租赁中租金比率的研究，多年来一直没有取得突破。
Owing to the lack of prime materials and the hindrance of ancient language, the research on the rent ratio of field-lease hasn't got creationary achievement.
古代埃及留下来的土地租约为我们了解它的农耕状况提供了有价值的原始资料。
The land lease of ancient Egypt society has provided the extremely valuable firsthand information for us to understand its agricultural cultivation.
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