最后，持续增加的人口很可能是通过不断扩大灌溉土地的面积和规模而得到食物供应的。

Finally, the growing population was probably fed by increasing the number and size of irrigated fields.

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在他生命的头几十年里，他遇到了一些重大的社会事件，并且快速增长的人口使食物供应无法一直维持。

The first few decades of his life were met with major social events, and a rapidly growing population that made food supply not last all the time.

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长久以来，随着紧张的食物和淡水供应，非洲的人口增长就是关注的源泉，但肯特坚决主张：实际上许多年轻人可以看做非洲的优点。

Population growth in Africa has long been a source of concern, as food and fresh water supplies are strained, but Kent argues that Africa's plentiful young may actually be viewed as its strength.

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