人的知识世代积累、相传成统。
Human knowledge is accumulated and passed on through generations.
分析引种不同世代法国莱茵鹅育雏期生长发育情况，了解莱茵鹅引入我国后的适应性，为鹅的改良和育种积累素材。
Oberve growth and development of france white roasting geese, analysis adaptation of introduced geese in our feeding standard and environment, so that we can accumulate.
致害性的转化是渐变的，在世代间似有遗传积累。
It seemed that there was a heritable accumulation from generation to generation.
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