1. Little rain and poor soil fertility are problems in that area, as in other parts of southern Africa. 乌干达东部和其他非洲南部的地区一样，存在着少雨和土地贫瘠的问题。
2. When Sirius appeared in the sky each year, the Nile generally started to flood and bring fertility to the land. 当天狼星每年在天空中出现的时候，尼罗河通常开始泛滥而且给陆地带来肥料。
3. Fungi are important in the process of decay , which returns ingredients to the soil , enhances soil fertility , and decomposes animal debris. 真菌在衰变过程中是十分重要的，它返回到土壤成分，提高土壤肥力，并分解动物残骸。
英英解释
n.
1. the ratio of live births in an area to the population of that area; expressed per 1000 population pe
2. the state of being fertile; capable of producing offspring
3. the property of producing abundantly and sustaining vigorous and luxuriant growth
